ITEM NAME:1/4'' 10KG BSP Air Compressor Safety Release Valve Pressure Relief Regulator JR #aucsearchbutton #aucsearchbutton:hover { cursor: pointer;.With a 1/4" 10KG BSP thread. 1 x 1/4" Compressor Pressure Relief Valve. Mainly used for the outstanding two grade air compressor protection. Critical applications on pressure piping, pressure vessels.