The original StillDragon Element guard. Suits 1"Bsp elements (all elements in store here are 1" BSP), it is supplied with a weep hole to alert you of any damage to the element O Ring. Please cut a small section from the supplied silicone gasket and align with the slot. To suit 2"ferrule, if ordering for a new unit, please also order a 2"ferrule, gasket and clamp. To be wired by a licensed electrician.