forged carbon steel fitting material conforms to ASME SA 105N,
forged stainless steel fitting material conforms to  ASME A182
forged steel fitting dimensions conform to ASME B16.11
NPT threadeds conform to ASME B1.20.1
socket fittings conform to ASME B16.11
forged union conform to ASME MSS SP-83
foged outlets conform to MSS SP-97
SW inserts conform to MSS SP-79
manufacturing facility is ISO 9001independent lab verification that fittings meet applicable chemical&physical properties.