2 PCS Brass Bulkhead Coupling Both End 1/4" NPT Female,Outer Diameter 3/4-16UNF Brass Bulk Head Pipe Fitting Bulkhead Tank Fitting Coupler Coupling,15/16" Length (Pack of 2)

Didn't know if these would work, but they work like a charm. Good quality and a value for the money. Would buy again if needed in the future.

These are really nice. I needed more so I bought them again. They work and look great.

Perfect for adding a breather hose to air intake on old vehicle. Drilled proper hole in air cleaner and mounted with proper barb fitting. Looks factory.

Just what I needed, worked great.

Good price, but the silicone gaskets are too soft and squeeze out from between nut and the bulkhead. Would be better if the gasket were a different more stiff material and the nut more like a flange nut. Overall it did work for my application but I had to make new gaskets out of cork rubber and even those started to squeeze out a bit, really need that flange, the contact area of the nut provided just isn't enough

Fantastic fitting, high precision. They held onto it for nearly two weeks, dont know why. When shipped it was lightning fast, next day delivery. If your in a hurry like I was find it quicker somewhere else. If you dont mind waiting quite some time for tiny products buy this one.

I made a cooling bucket for a home made water distiller. The bucket is a five gallon plastic. First attempt I drilled hole too big and washers squashed into hole and leaked. I think the washers are adequate if the hole is pretty tight. Seem to be holding up to heat fine. They allowed me to (after buying adapter) to use 1/4 “ compression fittings for copper tubing running from pressure cooker to cooling bucket.

Good tolerances and fitment. Used as vacuum line feedthrough on a KF40 flange blank connected to lab glovebox. Seals holding up well after a few hundred hours of service at low pressure differentials (~1-2mbar). Leak tests at 5mbar indicated good seals.

Very well made and sealed perfectly.