Lock nut for plastic taps
Lock nut for attaching certain barrel taps in tanks.
Plastic tap with 3/4 "thread is threaded through a 25 mm hole in a vessel or a tank. The nut is screwed on the back and tightened so that the tap plastic rubber gasket seals the vessel from the outside.
Fits all plastic taps here in the shop that lacks cap / lid and has a 3/4 inch plastic thread instead.