... machined 3.easy to connect and disconnect fluid coupling size:1/2"-6"body:stainless steel 304 316gasket:buna(NBR),viton ... "-2" 250PSI(17.6bar) 3"-4" 200PSI(14.8bar) 2 1/2" 225PSI(15.8bar)6" 150PSI(10.5bar)application:oil ... ,petroleum,chemical,water,gasthread:ANSI B1.20.1(NPT), BS21,DIN259,DIN2999,ISO228 Type D fluid coupling