【Premium Material】GUOFIS PEX-A female adapter made of lead free brass.The PEX-A adapter fitting not only resists corrosion and mineral buildup,rust and freeze damage,sturdy and durable,but also comply with drinking water standard. 【Easy Installation】 You can slide the expansion rings over the pex-a tubing and insert the pex-a thread female adapter,and then keep turning the expander tool,expand deeper until it bottoms out.Hold fitting in place until expansion ring and tube shrink annularly around the fitting. 【Widely Application】Our PEX-A female adapter fittings is designed to comply with ASTM F1960 ANSI/NSF-61 and ASSE 1061 Certified.Which is suitable for PEX A tubing fittings in water,oil and gas pipe systems. 【Product Compatible】3/4 inch PEX A female adapter compatied with expanding fitting system,Not compatible with stainless steel clamp & copper crimp ring systems. 【Package Include】There are 20 pack 3/4 inch x 3/4 inch pex-a female NPT threaded adapter in the package.The PEX-A fittings are easy to use,Only for Pex A pipe/tubing fitting connection.