effect sealing of the threads application_number US 62288990 A description the sealing apparatus and method of the invention will effectively seal pipe and straight threads for zero fluid drop leak tight systems up to and including 3 000 psi 4 500 psig proof and 7 500 psig min burst at elevated temperatures of 2 000 u00b0 f for 20 minutes minimum the inventive apparatus and method is also suitable for cryogenic 455 u00b0 f temperature environments referring now to fig1 a there is shown a two piece sealing apparatus consisting of a high temperature alloy such as red brass manganese bronze manganese silver bronze and the like threaded ring seal 1 and a 316 316l stainless steel compression retaining nut 2 having an undercut 2a to receive seal 1 the material is critical to effect sealing according to the invention a male threaded fitting 3 is threaded into a female threaded coupling 4 also having an undercut but female coupling need not be undercut 4a to receive seal 1 fig1 b shows the apparatus of fig1 a torqued in place in which the ring seal 1 and the nut 2 interlock and compress the ring seal to effectively seal the total surfaces of the threaded connections referring now to fig2 a diamond shaped high temperature alloy ring seal 21 is shown with the nut.