onelinkmore UHF Female to Female Coupler CB Radio Adapter Joiner Coax Connector SO239 PL259 UHF VHF Antenna 4 Hole Flange Panel Mount Adapter Pack of 2

Used to transition through the firewall...works just fine

Pulled the protective caps off, completely fell apart... no way it would hold the connection or be able to be waterproof...

They seem to be the quality I expected in the price range. There are better made connectors to be sure, but for the purpose that I bought them for (an offroad trailer) they fit the bill. No noticeable signal loss.

This is used on a manpack setup for a 2m radio. 3/4in hole for the pass through. 1in screws work with 3/16 aluminum. Nice connectors

I use these couplers to DIY build my own window multi coax feed-through panels. After installation, the panel is then grounded directly to nearby ground rod. In this particular case, the cost of parts and labor, provide for a better and stronger panel than the leading commercial manufacturers.

These are going to be part of the back panel of my SKB Go-Box. A jumper from the radio to a panel were I can easily mate the antenna coax to this bulkhead.

These things are very well made. I got a couple to make a ground plane antenna with some copper brazing rods. These are great in that instead of soldering the vertical to a pin on a normal 239 flange mount, you can solder the vertical into the cup. Works like a champ. If youre gonna make a ground plane antenna, get a couple of these!

Have not yet got the chance to huck them up and to try them out still working on my radio set up

Definitely a quality product will definitely buy more

well made and solid mount