Duraline Replaceable Pin female seal test tool. Use this tool to easily test the seals of female plugs against new molded pins to ensure long-lasting watertight connections. Works with molded pins A220200 and A243100. Screw the pin onto the tool and insert into load barrels of unenergized female plugs. when removed you should hear a pop and the pins should fit snugly into a female. If loose it indicates the female seals are worn out and connectors should be replaced.