The 7/8"-14 threaded adapter fittings are compatible with 10AN ORB (O-ring boss) ports. Because the threads on these fittings are not used for sealing, PTFE paste or thread sealant is not required. The O-ring should be lubricated with engine oil. ORB ports are an industry standard and found on many automotive plumbing products, including most Radium products. All fittings include O-rings, excluding the 7/8"-14 Banjo Fittings which include crush washers.