Pipe threads should be tightened 2-1/2 turns past finger tight. Machined to an exceptional tolerance level, with rolled threads for increased strength. NPT connections. For instrument air, gas, and liquid service Hex head plug is made of brass, which is used with brass pipe. 3/8 NPT 316 Stainless Steel Hex Head Plug 150# Fitting | Coyote Gear Solid Brass Pipe Fitting Pack Of 5 Bright Brass, 3/8 In Fitting Pipe Size, Male NPT, 3/4 In Overall Lg Brass Hex Head Plug Not For Potable Water Tape or pipe sealant is recommended. Stainless Steel Pipe Fitting BSPT NPT Male Threaded 3" Hex Head Plug - Plug and Hex Plug It is used in low to medium pressure applications. All pipe threads are American Standard Taper Pipe Threads.
