Recommendations 

• Recommendation B 2025 - Thermoplastic Piping for the Transport of Pressurized Gases - Revised 2026
• Recommendation D 2009 - Recommended Color Coding for Loose (non-captive) insert Stiffeners for Use With Mechanical Fittings on Polyethylene Pipe - Document under review and unavailable; contact PPI staff with questions
• Recommendation E 2021 - Recommendation Against Mixing Hydronic Heating Water with Potable Water
• Recommendation F 2022 - Testing PEX and PE-RT Tubing Systems with Compressed Air or Inert Gas
• Recommendation G 2023 - Recommendation Against Using Epoxy Pipe Coatings Within Plumbing Distribution Systems Utilizing Plastic Components 
• Recommendation H 2024 - Direct Connection of Plastic Piping Materials to Tankless Water Heaters 
• Recommendation I 2023 -  Guidance on Restoring Potable Water Piping Systems Post-Urban-Wildland Interface Wildfires
• Recommendation J 2026 -  Recommended Hydronic Snow & Ice Melting (SIM) System Performance Level Selections for Residential, Commercial, and Institutional Applications - New 2026
  
  

Statements

• Statement A 2024 - Relative Oxidative Aggressiveness of Chloramines and Free Chlorine Disinfectants on Crosslinked Polyethylene (PEX) Pipes Used in Treated Potable Water 
• Statement G 2017 - Indented Markings
• Statement N 2021 - Barrier Properties of Plastic Pipe Used for Potable Water Service
• Statement Q 2007 - Position Statement on Polyolefin Materials for Closed Loop Earth Coupled Heat Pump Applications - Archived - Consult PPI TN-55
• Statement S 2013 - Caution Statement on Heat Fusion Joining of Polyethylene Pipe And Fittings Based On Color
• Statement U 2020 - PPI Position Statement on the Use of PCR Materials in Polyethylene Pipe & Conduit
• Statement V 2017 - Recommended Color Code for Solid Wall Plastic Pipe and Conduit
• Statement W 2011 - Position Statement on Improved Material Categories for Polyethylene Pressure Pipe- Archived
• Statement Y 2023 - Taste and Odor of Drinking Water from Plastic Piping Systems  
• Statement Z 2017 - Use of Calcium Carbonate Additives in HDPE Conduit
• Statement AA 2025 - PFAS Chemicals and Plastic Piping for Portable Water Transport  - Revised 2025
• Statement AB 2023 - Microplastics and Plastic Piping for Potable Water - 
• Statement AC 2026 - Operating 90 °C and 105 °C Rated Cables with HDPE Conduit
• Statement AD 2025 - Use Of Pressure Rated PE4710 Pipe For Conduit Applications - New 2025
• Statement AE 2026 - Proper Application of ISO 18553 Test Method to PE and PP Pipe & Fittings - New 2026