If your valve is attached to your switch thru the bottom w/ a set screw, then this is your style. For copper unloader lines. Order this if your valve is broken. If this valve leaks continuously after it shuts off, then don't order this, order a check valve on the check valve page. It backfeeds this valve when defective giving a false sign that this needs to be replaced. If using nylon line, use brass tube insert for extra support.