... stainless steel case center back male connection oil composing:glycerine, silicone oil diameter:1.5",2",2.5",3",4",6". Panel Mount Stainless Steel ... ", 2 ½ ",3",4",6";2.Case: 304 stainless steel;3.Window:polycarbonate;4.Internal: brass, stainless steel;5.Inlet thread:1/8", 1/4 ... ", 3/8",1/2",NPT,BSPT,BSP;6.Connection: bottom connection, center back ...