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COOLANT FILTER FITTING SIZES
<HR style="BACKGROUND-COLOR: #d1d1e1; COLOR: #d1d1e1" SIZE=1><!-- / icon and title --><!-- message -->I AM GOING TO START COLLECTING THE PARTS TO BUILD A COOLANT FILTER. WHAT SIZE IS THE FITTING THAT GOES IN TO THE HOUSING JUST BELOW THE THERMOSTAT. MINE HAS A TEMP. SENDER IN THE HOLE FOR A ADD-ON TEMP. GAUGE: SO I WILL HAVE TO INSTALL A TEE FITTING FOR THE SENDER TO GO INTO THE TEE ALONG WITH A BARBED HOSE FITTING ON ONE SIDE AND A BRASS NIPPLE ON THE OTHER. WOULD LIKE TO HAVE THE FITTINGS BEFORE DRAINING DOWN THE COOLANT.
It's either 1/4 NPT or 3/8 NPT. I want to say it's 3/8 NPT. Seems like Guzzle has a nice write up on his site. You might check to see if he mentions the size.