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1/4 NPT Male to 9/16 Male1/4 NPT Male to 9/16"-18 Male low pressure adapter You can also use this adapter for connecting Swagelok QD to 2nd stage hoses! Converts second stage end of LP hoses to 1/4" NPT male thread Factory Cleaned - Viton O-Rings are used! Enriched Air Compatible For Low Pressure Only Below 200 psi (13.8 bars) Need to reduce the thread size of a 9/16" Female Threaded Scuba Regulator Low Pressure Hose to 1/4" Male Thread? Piranha Dive Mfg. 9/16-18 male to 1/4" male NPT adapter will allow you to do this! Our adapter allows you to attach a standard scuba regulator low pressure hose second stage end to smaller threaded requirements with a durable and corrosion resistant construction!