Sentinel Diaphragm Seals has guaranteed its system instrumentation from corrosive process flow environments. Blacoh warrants its Sentinel diaphragms and seal bodies for three years from date of purchase. If any failure or damage occurs with the diaphragm or seal body, Blacoh will replace them at no cost. Without Sentinel protection, hazardous and corrosive process fluids regularly contaminate and damage system instrumentation, shortening their service life. Sentinel Diaphragm Seals also work to ensure gauge and switch accuracy, smooth out erratic pressure surges, and allows one to replace expensive gauges with low-cost utility gauges. Furthermore, unlike many other brands, the strength and durability of Sentinel Diaphragm Seals holds up to the hand-tightening of your gauges.