spring for pex-al-pex pipe 1.size:16,18,20,26,32 2.certification:ISO9001 3.use for pe(x)-al-pe(x) pipe 4.OEM service external spring for composite pipe 1.size:16,18,20,26,322.certification:ISO90013.use for pe(x)-al-pe(x) pipe.4.Material:stainless steel5.length:as customer's request6.Certification:ISO9001