Attributes . Machined components are manufactured using solid 316 stainless steel bar stock. Stainless steel retaining rings and springs maximize corrosion resistance and extend service life. Steel componentry is plated using ROHS Compliant Zinc Nickel; Red powder coated external nipple O-ring for easy BOP service identification. Blow-out Prevention (BOP) couplings contain severe service FKM seals; PTFE anti-extrusion ring protects main coupling O-Ring from dynamic impulse pressure damage. Main valve seal is 'housed' to improve seal integrity during pressurized connection/disconnection. 316 stainless steel nipple connection - threads are coated to prevent galling during connection/disconnection. . Names