1. Stainless steel 304/316 materail 2. Side port & Half-clamp closure A. Material:Stainless Steel #304/#316LB. Housing tube type:Seamed,SeamlessC. End cap material:ABS,Stainless steelD. Max.working pressure:250psiE. Inlet port:3/4″female threadF. Outlet port:1/2″female threadG. Model:2521,2540,4021,4040,4080,40120,40160 Stainless Steel RO Membrane Vessel