Metalwork Metric 304 Stainless Steel Compression Union Tube Fitting, 12mm Tubing OD (2 Pcs)

Well made, double compression farrells allow the user to work on harder lines without leaking. Great price for these fittings.

I ordered this coupler the a hydraulic line on my tractor'. he wait time was almost a month. I couldn;t have the tractor down that long and had to buy the couplers elsewhere. The couplers are well made, but , the time to get them made them a "no go".

Worked great to repair a nicked 8mm transmission cooling line on a 2006 F-150. Nice quality and fast shipping.

used this on a fuel line with 70 PSI had no leaks

There was a description I read where the item fits sizes 1/8”-5/8”, and I thought how clever someone was to come up with that so I ordered it.Well no one was clever after all. After receiving it and found there was nothing special about it, I had to look the item up again.Well the joke was on me. You had to order the size you wanted. I knew it was too good to be true.Maybe on the main description they could say something like various sizes available.Come on you inventors make a coupling that has various bushings.

It says 3/8 male compression fitting, but it's not. It ONLY works for 3/8 TUBING. It does NOT connect to 3/8 compression female water supply hoses.

Wrong size, specifications of metric to standard not explained to determine correct size.

I’ve seen the unions elsewhere for this price each. This is a good price getting two for the same price.I used these to connect high pressure misting system tubing together. Definitely need to really tighten the nuts. What I thought might be quite enough torque resulted in the tubing being forced out of this union by the 1000psi pressure. No issues at all after putting together and cranking the nuts tight.