Description 3/8″ Square Drive Adapters are used to install and remove the 1/2″ NPT plug that is required in the RBB/ RBC V1, V3 swirl pots, and swirl pot with overflow combo. The heater port in the RBB/RBC V1 and V3 swirl pot and RBB/RBC swirl pot with overflow combo must be plugged because conventional fittings won’t work. The space is so limited that even the plug is a pain to install or remove if you ever need to service it. These 3/8″ Square Drive Adapters are purchased and then machined to reduce the space needed to use them. I only stock a few at a time, so please allow a day or two between the time you place your order and when it ships, just in case I’m out.
