PureT (TU-3) PE Tubing 3-8" - 500 Foot RollPureT Professional Tubing PureT TU 3 3 8" PE Tubing 500 Foot Roll Food grade polyethylene tubing for reverse osmosis systems, filters, and water treatment installations. Compatible with John Guest push fit connectors. 500 ft Roll 3 8" OD NSF Approved WHY IT WORKS Built for clean water transport and long term reliability Food Grade Polyethylene NSF certified PE material resists scale, chlorine, and common water treatment chemicals without leaching