This valve has a 3/4-14 NGT inlet thread which is common to most cascade bottles. Outlet is a CGA #346 (Breathing Air) with a working pressure of 3,000 psi. Be sure to select the proper burst disc pressure to match the DOT cylinder this valve this to by used on. This is a GV series valve. For full rebuild kits, order #46136. For replacement Bonnet and Stem only order #46135VS-GV. For replacement seat plug only order #4615SP-GV.