Learn about sealing National Pipe Thread (NPT) fittings.
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Pay attention to the hole size on the MPT thread side. For some odd reason, the hole diameter is much smaller compared to other similar compression fittings. As a result, these fittings did not fit onto my 1/2" FIP faucet connector which I use to connect to my chiller. My mistake. I should have paid more attention to the pictures or asked the question. I was able to make work using a PVC fitting for the transition.