This model is technically identical to the J997MDA-2H

Precise 1/4" x 1/2" Sizing: Engineered as a direct drop-in replacement for the legacy 243850 model

Calibrated as an L150-30F limit switch

You must replace the disk immediately after any overpressure event (bursting)

Laars Heating Systems R2013800 Flange Gasket 326058-758 This model is technically identicalThe Laars Heating Systems R2013800 Flange Gasket is a critical OEM replacement part engineered for high performance hydronic and domestic hot water systems. This multi pack of 10 gaskets is designed specifically for 3 inch NPT flange connections, providing a robust, leak proof seal that withstands the fluctuating thermal stresses and pressure variables found in commercial boiler loops. Fabricated from high grade, heat resistant materials, these