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The mud tank needs 2 types of unions, including hammer union and air union, air union is also called pneumatic union, since GN do not use such union in the mud tank design, we would like to introduce hammer union mainly. Hammer unions are one of the most common “quick connection” methods used in the oilfield for joining together components in a temporary pipe work system. Drilling mud fluid systems connecting the steel tanks to the pumps need leak proof and quickly detachable connections for large diameter pipe 4” to 16”.