Rubber Fitting for Small Block Water Pump

I just ran a tap into the nipple, I think it was 3/8" npt and put a brass allen socket plug in with a little peratex.

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Just as Steven190 stated. My neighbor runs nothing but small block drag cars and he taps and pipe plugs them all. There is enough meat, just use sealer and don't over tighten.

3/8 NPT? The only tap I have at my work is 1/8-27 NPT. What do you do about chips falling into your water pump?