Matco-Norca now offers Boiler Header Manifolds for use in residential plumbing applications. They are available 1-1/4 and 1-1/2-inch diameter and come in two, three, and four-zone. Matco’s boiler header manifolds are a prefabricated header for hot water boilers and can be used on the supply and return. They eliminate the need to make a boiler header out of pipe nipples and fittings. All Matco boiler header manifolds are shipped with thread protectors on all ends.