Fully approved to NSF Reg-4 and using WRAS approved materials, Serpents are designed to make the installers job much easier. The all stainless steel construction is certified for use with potable water. The outer cover is wipe clean and will maintain its good look for years to come.The pressure rating and flexibility of the product has been successfully tested for leakage and pressure to BS EN ISO 1086:2003 which specifies a maximum test pressure of 31.5 BAR and a leak test of 1.5 times that pressure.The unique construction allows forming around pipes or other obstacles and once in place, it keeps it�s shape!