Model #ExVrb2321-1
working to be done: 1) pump replacement: pump is ready. However I cannot remove swirl inlet nut, and the plastic cover for expose the pump. I have being already using w-40 to remove rust but failed.
I found there is few red thing on the threads close to orifice. I am wondering if there is some tread lock material on them so no way to remove the inlet connector(not sure right name).
If so, how can remove the thread lock to unthread this connector.

2) the trigger gun #17780 was not functional. water is flowing either squeeze the handle or release it.
disassembled it find no leaking on the tube, lace extension and the coupling.
I am wondering if there should be small parts missing, or just replace the O-rings.

Please provide the diagram of this type of trigger gun, so I may compare with my one to find and install the missed parts. I appreciate your great help.