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  <!-- 1. Homepage & Directory -->
  <url>
    <loc>https://plumbingtoolshub.com/en/</loc>
    <changefreq>daily</changefreq>
    <priority>1.0</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tools</loc>
    <changefreq>weekly</changefreq>
    <priority>0.95</priority>
  </url>

  <!-- 2. Core Pillar Tools (0.9) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-volume-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-flow-rate-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/drain-pipe-slope-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/drainage-fixture-unit-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/water-heater-sizing-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.9</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/plumbing-drawing-software</loc>
    <changefreq>weekly</changefreq>
    <priority>0.9</priority>
  </url>

  <!-- 3. Specialized Hubs & Category Calculators (0.8) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing-chart</loc>
    <changefreq>weekly</changefreq>
    <priority>0.85</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-volume-calculator-gallons</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-volume-calculator-litres</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/water-pipe-volume-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/gas-pipe-volume-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-flow-rate-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/gas-tankless-water-heater-sizing-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/electric-tankless-water-heater-sizing-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/rinnai-tankless-water-heater-sizing-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/rheem-water-heater-sizing-calculator</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/water-heater-size-guide</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/isometric-plumbing-drawing</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/bathroom-plumbing-drawing</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/bathroom-isometric-plumbing-drawing</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/plumbing-drawing</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/plumbing-symbols</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/plumbing-drawing-symbols</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/plumbing-blueprint-symbols</loc>
    <changefreq>weekly</changefreq>
    <priority>0.8</priority>
  </url>

  <!-- 4. Programmatic pSEO: PVC Schedule 40 & 80 Pipes (0.75) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/0-5-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/0-75-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/1-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/1-25-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/1-5-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/2-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/3-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/4-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/6-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/8-inch-schedule-40</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/0-5-inch-schedule-80</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/0-75-inch-schedule-80</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/1-inch-schedule-80</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/2-inch-schedule-80</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/3-inch-schedule-80</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pvc-pipe-volume-calculator/4-inch-schedule-80</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>

  <!-- 5. Programmatic pSEO: Copper Type L & Type K Pipes (0.75) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator/0-5-inch-type-l</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator/0-75-inch-type-l</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator/1-inch-type-l</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator/1-25-inch-type-l</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator/1-5-inch-type-l</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator/2-inch-type-l</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator/0-5-inch-type-k</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator/0-75-inch-type-k</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/copper-pipe-volume-calculator/1-inch-type-k</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>

  <!-- 6. Programmatic pSEO: PEX SDR-9 Tubing (0.75) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/pex-pipe-volume-calculator/0-5-inch-pex</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pex-pipe-volume-calculator/0-75-inch-pex</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pex-pipe-volume-calculator/1-inch-pex</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>

  <!-- 7. Programmatic pSEO: Tankless Water Heater Sizing by Home Config (0.75) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing/1-bedroom-1-bathroom</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing/2-bedroom-1-bathroom</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing/2-bedroom-2-bathroom</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing/3-bedroom-2-bathroom</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing/3-bedroom-2-5-bathroom</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing/4-bedroom-2-5-bathroom</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing/4-bedroom-3-bathroom</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing/5-bedroom-3-bathroom</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/tankless-water-heater-sizing/5-bedroom-4-bathroom</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>

  <!-- 8. Programmatic Cast Iron Pipe Volume Spokes (0.75) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/cast-iron-pipe-volume-calculator/1-5-inch-cast-iron</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/cast-iron-pipe-volume-calculator/2-inch-cast-iron</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/cast-iron-pipe-volume-calculator/3-inch-cast-iron</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/cast-iron-pipe-volume-calculator/4-inch-cast-iron</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/cast-iron-pipe-volume-calculator/6-inch-cast-iron</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/cast-iron-pipe-volume-calculator/8-inch-cast-iron</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>

  <!-- 9. Programmatic Schedule 40 Steel Pipe Volume Spokes (0.75) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/steel-pipe-volume-calculator/0-5-inch-schedule-40-steel</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/steel-pipe-volume-calculator/0-75-inch-schedule-40-steel</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/steel-pipe-volume-calculator/1-inch-schedule-40-steel</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/steel-pipe-volume-calculator/1-25-inch-schedule-40-steel</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/steel-pipe-volume-calculator/1-5-inch-schedule-40-steel</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/steel-pipe-volume-calculator/2-inch-schedule-40-steel</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/steel-pipe-volume-calculator/3-inch-schedule-40-steel</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/steel-pipe-volume-calculator/4-inch-schedule-40-steel</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>

  <!-- 10. Programmatic Drain Pipe Slope by Diameter Spokes (0.75) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/drain-pipe-slope-calculator/1-5-inch-drain-pipe-slope</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/drain-pipe-slope-calculator/2-inch-drain-pipe-slope</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/drain-pipe-slope-calculator/3-inch-drain-pipe-slope</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/drain-pipe-slope-calculator/4-inch-drain-pipe-slope</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/drain-pipe-slope-calculator/6-inch-drain-pipe-slope</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-flow-rate-calculator/0-5-inch-pipe-flow-rate</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-flow-rate-calculator/0-75-inch-pipe-flow-rate</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-flow-rate-calculator/1-inch-pipe-flow-rate</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-flow-rate-calculator/1-25-inch-pipe-flow-rate</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-flow-rate-calculator/1-5-inch-pipe-flow-rate</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-flow-rate-calculator/2-inch-pipe-flow-rate</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-flow-rate-calculator/3-inch-pipe-flow-rate</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/pipe-flow-rate-calculator/4-inch-pipe-flow-rate</loc>
    <changefreq>monthly</changefreq>
    <priority>0.75</priority>
  </url>

  <!-- 11. Informational & Legal (0.4) -->
  <url>
    <loc>https://plumbingtoolshub.com/en/about</loc>
    <changefreq>monthly</changefreq>
    <priority>0.4</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/contact</loc>
    <changefreq>monthly</changefreq>
    <priority>0.4</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/privacy-policy</loc>
    <changefreq>monthly</changefreq>
    <priority>0.3</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/terms-of-service</loc>
    <changefreq>monthly</changefreq>
    <priority>0.3</priority>
  </url>
  <url>
    <loc>https://plumbingtoolshub.com/en/disclaimer</loc>
    <changefreq>monthly</changefreq>
    <priority>0.3</priority>
  </url>
</urlset>
