KOOTANS 4 Pack Fitting Female Street Review

Bought an old air compressor for refurbishment and needed tees for various fittings. I didn't know this existed, with two women and one man. So perfect! Works great, no leaks at 120psi.

They came exactly as advertised except I am concerned about the depth of the internal threads. My fitting can only go in about 1-2 threads which seems very small given the pressure I will be using. I doubt they will hold up and I may have to throw them away for safety reasons. However, the external threads are not dimensioned.

I use them to add gauges as well as NPT (National Tapered Pipe) water lines as they have one male connector instead of three female ones. this creates a shorter thunk for my application. These are standard tapered threads (seems more and more straight tube fittings are labeled as tapered these days)