These fittings are made from CF8M (316) Stainless Steel material and conform to ISO 4144 standard. Threads are to ISO 7-1 (DIN2999) BSPP Female, BSPT Male. Material certificates available on request (must request prior to purchase. Manufacturer tests & inspects prior to despatch. 12 month warranty from date of installation. Manufactured in accordance with ISO9001:2015 quality system.