Ok, Im doing the Sanjay DIY reactor and it wants a 4" PVC female adapter (FNPT x Slip), but all I could find on ACS is the same but FIPT (Is this National vs. International? Are they equivalent or what?

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

Not sure if that does....I just want to make sure I order the right thing :).