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== PEX Fittings, Valves, and Materials ==HydroPEX Fittings are clamp/crimp style fittings, ProPEX are Expansion Style PEX Fittings, and there are Sharkbite Compression style PEX fittings. To make clamp connections the Clamp tool and stainless clamps are required, to make crimp connections a crimp tool and copper crimp rings are required, finally to make Propex connections a Wirsbo ProPEX tool and ProPEX Rings are required. The Sharkbite Compression fittings are not recommended by some plumbers due to perceived limited longevity.There are four basic PEX connection systems. The first is the Wirsbo ProPEX system that requires the ProPEX expander tool, ProPEX rings and ProPEX fittings. This connection system can only be used with PEX-a tubing. The second is the stainless steel clamp system that requires a clamping tool, stainless steel clamps, and barbed PEX fitting (HydroPEX). Third is the copper crimp ring system that requires a crimping tool, copper crimp rings, and barbed PEX fittings (HydroPEX). Last is the Sharkbite, compression-style, fittings that do not require a special tool. HydroPEX fittings may be used with the stainless steel clamping system or the copper crimp ring system. These PEX fittings may be used for PEX Plumbing. They allow you to make connections while using PEX Tubing.ProPEX Fittings are expansion style fittings. These PEX Fittings are manufactured by Uponor, formerly known as Wirsbo. The fittings are widely used throughout the US and Europe for PEX Tubing connections.SharkBite Push-Fit Fittings are designed to simplify pipe installation. The fittings allow users to connect pipe in seconds with ease.Instant push-fit connection for increased ease of use. Certified to 200 psi and 200°F (93°C).The Viega PEX Press fitting system meets strict ASTM standards in addition to UPC and international codes for potable water systems. The high quality bronze PureFlow PEX Press fittings are more resistant to corrosion and stress cracking.