Black Malleable Steel Unions Are Used For Use With Natural Gas or Hot Water Heating Systems And Plumbing Applications.
Black Malleable Steel Unions are made for long lasting durability and dependability. Black Malleable Steel fire and corrosion resistant properties make it especially useful for natural gas or hot water heating systems or plumbing applications. Not recommended for use with potable water applications. Standard Class 150 Black Malleable Steel and Extra Heavy Class 300 Black Malleable Steel varieties are available in various combinations of 1/8, 1/4, 3/8, 1/2, 3/4, 1, 1-1/4, 1-1/2, 2, 2-1/2 and 3 inch diameter sizes.