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Hi Psyduck,
NPT is tapered pipe, I not sure about IPT but if it the same as British pipe, it is a straight thread. Straight thead requires a thread sealant of some type to prevent leaks. Use a acrylic/silicone based one like PST by Locktite. It works well in low presssure applications [< 250 psi] after it cures about 2 hours. It is service remaveable.
Hope this helps
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Bill in Ohio
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