½¨ npt-f x flanged vent/isolate: no bracket-holes: yes equalize: yes     type in x out thread type body stem packing M1H 1/4"x1/4" 3/8"x3/8" 1/2"x1/2" npt bsp Carbon steel AISI 304 AISI 316 AISI 316L Monel Hastelloy C HS SO PTFE glass filled PTFE grafoil