Mike searched all over to find this fitting that is perfect for the water heating coils. The inner threads fit the water heating coil. The outer threads are 2″ coarse threaded and fit large barrels/drums such as 50 gallon drums. Use this adapter in place of the cap on the drum and you have a sealed water heating diversion load. You do need to be sure that it is full of water. The water coil must always be in water if it is heating.
Adapter Fitting only