BY-passing heater
Pretty easy to tap the pump housing hose barb, just stuff a piece of soft foam or even paper towel into the port to catch shavings, and slowly run the tap, little at a time, backing out to clear cutter threads often. The casting of the barb can be irregular in thickness and the hole offset sometimes, thinner on one side, and if too aggressive with the tap you may split the barb. I used liquid thread sealer, screwed in the 1/4npt plug until snug. No leaks.
Pretty easy to tap the pump housing hose barb, just stuff a piece of soft foam or even paper towel into the port to catch shavings, and slowly run the tap, little at a time, backing out to clear cutter threads often. The casting of the barb can be irregular in thickness and the hole offset sometimes, thinner on one side, and if too aggressive with the tap you may split the barb. I used liquid thread sealer, screwed in the 1/4npt plug until snug. No leaks.
