Review on Zerostart 3100040 Engine Block Heater: Ford, Lincoln, Mercury. CSA Approved, 120V, 600W by Rob Kerr

installation I have enclosed according to the instructions of the heater. I completely rebuilt the engine so I installed it while the engine was on the workbench. About 2 weeks later it started leaking. I drained the system, pulled it out and replaced the o-ring on it. It was almost 2 more weeks before it started leaking again. The part holding it seems to tighten unevenly, allowing it to pull crooked and start leaking.