BestPEX Lead Free brass insert PEX fittings meet NSF-Annex G for Lead Free System, ASTM and CSA specifications and are ideal for professional installation or do it yourself plumbing repair. BestPEX PEX Lead Free fittings are compatible with copper PEX crimp rings, stainless steel PEX Clamps and any brand or type of SDR-9 PEX tubing. BestPEX Lead Free brass insert PEX fittings require the use of a copper ring PEX crimper or stainless steel clamp PEX crimper. Installation is easy – cut the PEX tubing square, slide a copper ring or stainless steel clamp along the tubing, insert the barbed fitting into the end of the tubing, slide the ring over the barb so its about 1/8” from the body of the fitting and crimp the ring/clamp with the PEX crimper. Rings and Clamps are sold separately unless specified in the description.