One of the few times we ever recommend a filter on the suction side of a pump is with our diaphragm pumps. Diaphragms are a bit vulnerable to damage from small sharp objects so it is a great idea to install one of our suction filters on any diaphragm pump. This one should be installed in the suction pipe when you have 1/2" or 12mm suction pipe.
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It just what I needed good quality very pleased