Krueger Sentry Gauge OFS1-1.5-21 Type OFS1 1.5” Opening Overfill Alert Gauge is used for 21” Depth Tank. The Overfill Alert Gauge is a high-level visual gauge designed to visually alert you that your AST (tank) is nearly full. This overfill monitor’s simple pop-up mechanical design promotes easy installs, maximum durability, and low upfront costs.

Features

• HDPE Plastic nut
• Aluminum Bushing
• Stainless Steel Rods
• HDPE Or Polypropylene Float
• Available in 1.5” NPT opening
• Designed to alert when tank is about 90% full
• Multiple material options and accessories available
• Length is the point at which you want the level of the tank to read the overfill
• When ordering specify your size opening and exact tank depth—every gauge is made custom to fit your tank.