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No.. They go into the middle of the lower radiator hose. You cut the lower hose and put it in with 2 clamps. You plug them in and there is a heater element in the little tube that was inserted in between the half's of the hose. The engine comes up above freezing at -25 here in the mountains of...

In my jeeps, there is not freeze plug heater I have found for it. I use a lower radiator hose heater.. That works good in the middle and the heat rises to the block. Not to expensive. About $30. My 5 ton had a block heater in a plate on the block.