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- MS-2 2000 - Model Specification for Polyethylene Plastic Pipe, Tubing and Fittings for Fuel Gas Distribution Systems - Document under review and unavailable; contact PPI staff with questions
- MAB-3 - Model Specification for PE 4710 Burried Potable Water Service, Distribution and Transmission Pipes and Fittings Note: This replaces MS-3
- MS-4 2017 - Model Specification For Polyamide 11 (PA-11) Plastic Pipe, Tubing and Fittings for Fuel Gas Distribution Systems
- MS-5 2018 - Model Specification for HDPE Solid Wall Conduit
- MS-6 Model Specification and Checklist for Polyethylene (PE) Pipe for the Sliplining of Sewers Document under review and unavailable. Contact PPI staff with questions.