NAT Gas, 3/4" FPT Gas In/Out,1/2 Psig Certified, 1 PSI Tested, 3"-6" WC, Maxitrol # R500-66-0003 With Vent Limiter #12A06, # 26-2265 Mainly Used In Indoor Applications To Limit The Amount Of Escaped Gas In The Event Of A Diaphram Failue. Solid State Pocket Gas Detector # 85-1101 Teflon Thread Sealing Tape, # 85-1109 (1/2" X 520") Teflon Sealing "Pink" H/D Tape # 85-1130 (1/2" X 260") "Gripp" Heavt Duty Thread Sealer 1/2 Pint , # 85-1101 PTFE Heavy Duty Thread Sealer 1/4 Pint # 85-1136