2PCS Brass Hex Swivel 1/4" NPT to 3/4 inch Female GHT Garden Hose Thread Connector Adapter,Garden Hose Pipe Fitting For Fuel/AIR/Water/Oil/Gas WOG

My biggest concern was how to tighten a pressure gauge onto this, so I was glad they included a solution. As others have said, you need a 10mm allen wrench to tighten this.The product pictures do not show the hexagonal shape on the inside, but it’s there for allen keys. You can use the L style (traditional) or the kind that are attached to a socket adapter (see my pictures).Another reviewer had a good idea, they removed the washer, and tightened it onto a hose thread very tight, and put the pressure gauge on that way. If you don’t have an allen that large, it’s not a bad idea, just be careful you don’t crack anything.Also, it was not clear that you get 2 brass setups, 2 black washers, 2 silicone washers, and some Teflon tape. You absolutely want Teflon on the ¼” threads. But, never use Teflon on hose threads. On a hose, the washer seals, the threads do not seal. So it’s a MUST on one side and MUST NOT on the other side.Also don’t double washer, that usually results in leaks (but not always).I got this because I wanted a pressure gauge to adjust my well pump pressure and my storage tank pressure. I wanted the pressure gauge to be 0-100 so I could see very clearly what the pressure was (using a 0-200 or 0-300 are half or third as precise, visually). This adapter allows me to put a standard 0-100 pressure gauge on a hose bibb. Nice!

This is a durable quality product. The reviewer that said you need a 10 mm Allen wrench to tighten is absolutely correct, see photo. I did not have a 10 mm wrench so I tried something else to thread in a 1/4 npt nipple. Remove the rubber washer then tighten the adapter to a GHT. You can then tighten in a 1/4 npt fitting without it turning. I did go out and buy a metric Allen wrench set since at Lowe's. Also I saw some questions on the washers. Typically red washers are silicone for higher temperatures. Black are usually Buna-N or Neoprene for normal temperatures. Just my educated guess. Oh, I saw one reviewer tried to use 2 washers. Only one required.

VERY GOOD

Nicely made and useful for adapting a pressure gauge to a standard garden hose fitting. It's designed for a 10mm Allen wrench to keep the adapter from turning while attaching the 1/4" NPT gauge.

Applied these to hydronic system for gauge adaptors using the manifold drain ports, worked great with a set of 60 psi gauges. The brass is tumbled and free of burrs, also you are provided 2 gasket materials, rubber and silicone?

Works great for connecting pressure gauge to boiler valves!

Trabajan adecuadamente con la espiga de 1/4 pulg y se acoplan muy bien a la rosca de la llaves de jardín.

Great product that does what it is intended for. I used these to make an emergency water filtration setup off of a basement water spigot. Solid metal so no cheap plastic.

They are somewhat pricey but saved me a lot of trouble. Nice heavy brass. They are designed to attach and tighten to valve using a hex key. Would recommend product. Bob S.