Model 1088 Rev B Spring Operated Tank Blanketing Valve Vacu-Gard; Horizontal Outlet Position, Internal Sensing; Stainless Steel Body And Trim With Epoxy Coated Carbon Steel Diaphragm Cases; No Pressure Gauges; 1/2" FNPT End Connections; 40% Flow Plug; Fluorocarbon Elastomer (FKM) Soft Seats And Seals; 0.75" - 1.5" wc Range Spring; No External Filter