Weil McLain 510-312-091 Hi-Low Limit 320788-703 Built with a 1/2-inch bore

Built with a 1/2-inch bore and high-grade galvanized steel blades

a fatigued or ruptured diaphragm can lead to erratic pressure fluctuations or total valve failure

The 36-inch capillary tube with a 1/4-inch female flare nut allows for flexible mounting

Resilient Sealing: High-grade NBR seals provide excellent resistance to common fuel gases and air contaminants

Weil McLain 510-312-091 Hi-Low Limit 320788-703 Built with a 1/2-inch boreThe Weil McLain 510 312 091 Hi Low Limit is a specialized hydronic control engineered for precise water temperature regulation in residential and commercial boiler systems. Designed for field proven reliability, this aquastat limit control manages the high limit (to prevent system overheating) and the low limit (to maintain base water temperature), crucial for boilers equipped with tankless coils. This W M OEM part features a 120 VAC power rating with