Connect and disconnect tubing without tools. These Acetal Celcon fittings meet FDA standards and are NSF listed. The O ring/collet design features S.S. teeth for extra gripping power. Acetal bodies, Nitrile O-rings, and acetal/stainless steel collets meet requirements for food grade and high-purity applications. Fittings withstand temp from 33° to 158° F and pressure from full vacuum to 150 psi. Use fittings with polypropylene, polyethylene, and other rigid tubings. Special adapters (tube-to-hose stems and elbows) let you use soft tubing such as Tygon or silicone. Create rotating swivel connections by connecting special stem adapters with male pipe threads together. NPTF-Dry seal threads that do not require sealer.