McDonnell & Miller 69 Cut Off 30067439-890 Always verify the capillary length

Always verify the capillary length and temperature range for your specific application

Test for continuity across the leads to verify a burnout

offering a maintenance-free solution for your critical installations

Key Benefits Universal Range Capability: Includes springs for 3-6

This comprehensive service kit is engineered to restore factory-spec relief valve functionality

McDonnell & Miller 69 Cut Off 30067439-890 Always verify the capillary lengthThe McDonnell & Miller 153900 (Series 69) is a professional grade mechanical low water cut off designed for reliability in low pressure steam boiler applications. This auto reset unit features a 4 1 8" insertion length and is engineered for mounting directly into 2 1 2" NPT boiler side tappings, making it compatible with residential and commercial boilers of any steaming capacity. By utilizing a packless bellows and a dual switch assembly, this