Benjamin CO2 Fill Adapter, Fits Discovery & Challenger

Nice to have a hose already set up with the fittings.

Make it a little longer. A bit short.

Nothing

Very poor design broke after two uses.

Not buy it

Get the better one it works great. This one wont bleed and blows its oring out then no longer works bad buy at any price.

Simple to use... Worked reasonably well for the first three fills, then sprung a leak at the hose connection... Hopefully a rare defect. I''ll get another and see how it goes.

Lower the price. Add three inches to the hose. Add a blender screw, hose is too short to unscrew the bottle while attached to the gun rendering the bleed hole useless. A gage would be nice. Threads are a tad course as well.

Wrap a rag around the connector when removing to protect your gun from scratches as the quick connector "POPS-OFF"... Not a big deal, but I learned the hard way.

well built

Needs a bleeder valve

Loud when disconnecting from rifle

The equipment appears to be well made from stron material (braided hose)

A longer hose would make the adapter easier to use. A bleed valve to remove pressure from the hose when finished should be added.

In this case I'm glad the hose is short. First time I used the adapter, I connected it to the gun and the tank, filled the gun, turned it off at the tank, started to lay the tank down to get a different grip on the tank to unscrew the adapter from the tank (slowly to bleed the hose), and the quick connect connector came off the gun nipple. Loud bang, hose whipped around but missed me, and I thought to myself that I was glad it didnt come off while the valve was still open and that I'm glad the hose is short. Don't know if it will happen again -I think the QD connector was firmly in place- but if it does fail again I will send it back. I have only used it the one time so far.

PRETTY COOL PRODUCT.

lONGER HOSE

It works, but not well. Because it lacks a pressure release valve, it is extremely hard to remove from the CO2 cylinder when you're finished filling your PCP. It was so hard to remove I was afridi I would break off the end of the tank. I returned it. I returned this

It is what it is.

For CO2 filling, buy the Air Venturi model# 2990 instead. More expensive, but well worth it.
The pressure release valve works very well.

Well made.

This thing needs a bleed valve. Unscrewing it from the bottle to expose the bleed hole while under pressure is difficult and I think will eventually gall the threads.

The first two times I used it, I had a huge leak around the 1/4-20 valve thread when I opened it up and lost most of my CO2. The seal finally "seated" and the leak stopped.

Well built, all metal construction. Works perfectly. Has a small hole for bleeding the extra co2 from the line.

Nothing.

Works great. I get 6-7 fills from a 20oz co2 bottle averaging @60 shots per fill. I do not have a chronograph so i can't speculate as to what my fps is working out to. Using Crosman Premiers i am getting great accuracy at short range(25 yards or less). There is a small hole for bleeding the excess air from the hose line. You unscrew the cap all the way out to stop the co2 flow. Then you unscrew the co2 bottle until the hole is exposed and this lets the excess air in the line vent. I You will get at least 300-400 shots per 20oz probably more. I experienced some condensation on the Discovery's tank during a very humid day so be aware and keep your metal lubricated well.

It works, but see below.

This adaptor does not have a bleeding valve. When you are done filling the gun, during disconnecting, an O ring seal usually popout from the female coupling. You will need to put it back before refilling. I am going to find a T fitting and a ball valve to serve as the bleeding fixture. So I don't have to look for the flying o ring.