RR Robust Radiator Diameter 1″ Length 3″. This is the coil length and ID. At least 0.5″ extension on each side beyond coil length. This is a plug in model. Regardless without the IBAN or BPAN control panel there are chances that unit can get over heated.
Optional: Tube with two end caps may be placed in the Robust Radiator. Tube will protrude at least 1″ beyond the RR face. Please note that the power available from the RR for heating is lower when a tube is placed in it. The internal temperature in the tube will depend on the load in the tube.