M77 x 200 steel welding sleeve for screw plug immersion heater

M77 x 200 steel threaded sleeves to be welded to the surface of a tank or to the end of a pipe for mounting a screw plug immersion heater. The welding sleeve is the ideal solution when the inside of the tank is not accessible. It allows the threaded immersion heater to be screwed on from the outside and guarantees a perfectly watertight installation thanks to its sealing surface.