Series SSL Gauges have dual English/metric scales with 1% full accuracy. A 4 inches glycerine-filled gauge, the unit is designed with a 304 stainless steel housing and 316L stainless steel wetted parts for chemical compatibility. Gauges come standard with a 1.5 inches Tri-Clover process connection for easy installation with a tri-clamp fitting. A wide selection of ranges are available from full vacuum, compound to 300 psi.