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.
Optional: Tube with two end caps may be placed in the Robust Radiator. Tube will protude at least 1″ beyong 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.