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• Recommendation B 2020 - Thermoplastic Piping for the Transport of Pressurized Gases
• 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 2016 - Recommendation Against Mixing Hydronic Heating Water with Potable Water
• Recommendation F 2016 - Testing PEX Pipe and Tubing Systems with Air
• Recommendation G 2017 - Epoxy Pipe Coatings in Plumbing Systems with Plastic Components
• Recommendation H 2020 - Direct Connection of Plastic Piping Materials to Tankless Water Heaters

• Statement A 2019 - 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Q 2007 - Position Statement on Polyolefin Materials for Closed Loop Earth Coupled Heat Pump Applications (This document is obsolete, please refer to TN-55)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 2017 - Taste and Odor of Drinking Water from Plastic Piping Systems
• Statement Z 2017 - Use of Calcium Carbonate Additives in HDPE Conduit
• Fusion Statement 2010 - Joining PE Pipe Using Heat Fusion Technology Document under review and unavailable. Contact PPI staff with questions.