Lead-free brass which is high temperature ductility and low magnetic permeability.Durable and Non-Pollution. Smooth and deep threads allow the fittings to be better engaged with the pipe to enhance fixation,easy to install. Cooperate with stainless steel clamp rings,or PEX Crimp tool and copper rings.(Not included) These crimp adapter can be used for connection of PEX and NPT internal threaded pipes.Effectively applied to water,oil and gas system. If you have any questions about the product or need assistance when using it,please feel free to contact us,we will help you make the everything right again. Temperature range of 32℉—200℉.This brass crimp adapter can be used for PEX pipes in plumbing jobs.Applied in water supply,gas supply,and underfloor heating systems. These products are manufactured according to national standards,high quality and safe.Uses strict Hot-Forged processing for superior strength and stability.