1 x Blanking Plug 1/2". 1 x Air Vent Plug 1/2". Towel Rails Hooks. Black Towel Radiators. Electric Towel Radiators. White Towel Radiators. Heated towel rails can be used as electric only. The expansion and contracting is all done inside the radiator and can do so freely as long as there is a sufficient gap at the top of the towel rail.