AP Model air breather is installed on the top cover of the reservoir. - Port size 02~24 needs PT female thread on the top cover for instalation. - Very simple design and the element is washable. - Model 02-24 uses nominal rated filter medium. Model 32 and 48 are able to use different type of filter media. - A Model AP-02 is different from the drawing shown. 1)Element lower holder is one assembly with connecting thread. 2)Screw for top cover is Philip cross screw.。 - AP 32 and 48 are flange connection - JIS5K-FF flange.