The Monument 361T Box Ring Immersion Heater Spanner is a specialist tool designed for installing and removing immersion heaters in domestic hot water cylinders. This slogging-type spanner features an octagon at the base of its cylindrical section, allowing plumbers to strike the handle when loosening stubborn or seized immersion heaters. Built from a one-piece casting, this immersion heater spanner delivers full power transmission directly to the fitting, eliminating the weaknesses associated with loose tommy bar designs. The compact overall clearance of 7/8in (22mm) around the spanner makes it particularly effective when working on insulated copper cylinders where space is restricted. Ideal for heating engineers and plumbers working on cylinder maintenance, replacement, or installation projects, this British-made tool provides the durability and leverage needed for professional results. The box ring design ensures secure engagement with the immersion heater boss, reducing the risk of