McDonnell & Miller 63M-HD Low Water Cut-Off Head MechanismThe McDonnell & Miller 63M HD Low Water Cut Off Head Mechanism is designed to provide reliable boiler safety by precisely detecting low water levels and triggering a safe shutdown when needed. This head mechanism is a robust replacement for the 63 Series Low Water Cut Off, delivering consistent performance in demanding boiler applications. Built for compatibility with typical McDonnell & Miller 63 series controls, it includes a manual reset option,

Mechanical Properties: Tensile Strength 11

supporting long service life in crawlspaces

Choose the Goodman 10123534SP to maintain reliable system protection and steady performance across seasons

Outlet pressure: 1 to 3

The Armstrong 10F73 includes a shunt for quicker reset and an additional cover for safety and protection

The controller supports up to three sensor inputs and a maximum sensor distance of 1000 ft

this valve is ANSI/ASME compliant and rated Class 150 static (217 psi at 248°F)

safe control

Includes: Tinnerman Clip

with a precise fit and dependable performance

and a rugged plastic enclosure with NEMA 1 and IP67 protection

this kit helps restore precise regulation and minimize downtime by replacing critical sealing parts with factory-grade components