1. Compatibility
   Ensure materials are compatible with your existing plumbing system to avoid leaks or damage.

2. Material Type
   Understand the differences between materials (e.g., copper, PVC, PEX) and choose according to your needs (e.g., durability, flexibility).

3. Local Codes
   Check local plumbing codes and regulations to ensure your materials meet legal standards.

4. Size and Dimensions
   Measure pipes, fittings, and fixtures accurately to ensure proper fit and avoid leaks.

5. Quality and Standards
   Look for materials that meet industry standards (e.g., ASTM, NSF) to ensure reliability and safety.

6. Pressure Ratings
   Verify the pressure ratings of pipes and fittings, especially for high-pressure systems.

7. Temperature Tolerance
   Choose materials that can withstand the temperature of the fluids passing through them, particularly for hot water systems.

8. Cost
   Compare prices, but balance cost with quality. Sometimes cheaper options can result in higher long-term costs.

9. Brand Reputation
   Opt for well-reviewed and reputable brands to ensure durability and reliability.

10. Warranty and Customer Support
    Check for warranties and available customer support to address any issues post-purchase.

11. Ease of Installation
    Consider whether you'll be installing the materials yourself or hiring a professional, and choose accordingly.

12. Sustainability
    If eco-friendliness is important, look for materials that are recyclable or made from sustainable sources.

13. Availability
    Ensure materials are readily available at your local suppliers or online to avoid delays in your project.

By keeping these tips in mind, you'll be better equipped to choose the right plumbing materials for your project.