A Y M Insulated Three Part Unions

AY McDonald Insulated Three Part Unions

3 Part Insulated Union


A.Y. McDonald Mfg. Co. carries Female Insulated 3 Part Unions, which are designed to prevent electrolysis or other corrosive action in 3/4” through 2” gas service lines. They are resistant to most chemical substances, including gas, water, and petroleum at normal temperatures. Create more safety to the gas meter set by choosing these ANSI B1.20.1 compliant Female Insulated 3 Part Unions!


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With heavy hearts, we announce the passing of our founder James (Jim) Bell.

Jim passed away on June 15, 2021. He will be greatly missed by his colleagues, family, friends and the many people he impacted over his 89 years of life. His full obituary can be found here.

In observance of his passing, all ECCO/GASCO offices will be closed, Friday, June 18.