Viair 90006 Air Locker Tank Port Fittings Kit Kit includes one plug, one 1/4 inch Male NPT to 1/8 inch Female BSP adaptor, drain cock, compression fitting, 175 PSI ASME coded safety valve All fittings are 1/4 inch NPT Thread sealant is recommended for use with all brass fittings All brass construction Always use a drain cock and a safety release valve when installing an onboard air system