Vacuum Breaker – OPW Engineered Systems Vacuum Breakers permit quick, positive evacuation of the arm after the loading operation is complete. Suggested for any top load/submerged fill application.
Model 476SA – Aluminum with stainless steel internals, fluorocarbon seal, ½ MNPT , OPW Model 476SA-0150
Model 489 – 30 Stainless Steel construction, metal seat, MNPT, available in ½” (OPW Model 489-0050) and 1” (OPW model 489-0060)