JoyTube Plastic Hose Barb Fittings 1/8" Barb X 1/8" NPT Male Thread Adapter Connector Pipe Fittings (pack of 6)

All 6 of the 1/8" NPT threads were undersized. The large OD of the thread is about .377" and the lead-in thread size is about.359". The thread pitch seemed ok but in my application the male threads would barely engage at the bottom of a female valve. It might work with lots of teflon tape but I'm not even going to try such a thing. They will be returned.

Not much taper on the pipe thread, and not totally round as there are two lines where the mold splits. But it seemed to seal when I tightened it down. I'm looking for something better now.

Let's be clear. This does not have a 1/8" NPT thread. My guess is its 1/8" BSPP, but I'm not sure. The one thing I'm sure about is it's NOT NPT. It will thread into a NPT fitting for a distance (maybe 6 or 8 threads) until the threads start to get mangled and then it will bind up. You might be able to get it to seal if you use a lot of teflon tape, but no guarantee. Wouldn't trust this in any process with temperature and pressure greater than 120 deg. F and above 10 PSIG.

These are low quality. Very brittle and break easily.

If you have to pull any tube off of them they break in half. Very cheap

POOR QUALITY. 2 OUT OF 5 BROKE DURING INSTALLATION

These are 1/4 inch. NOT 1/8 inch. They do not fit as described.