Air tank regulator

You can also "tether" without a regulator - I do it all the time, even though I do have a regulator that I can use when I want to.

You can use your tank just like filling your gun's reservoir, except when it is as full as you want you simply close the tank's valve and leave the line charged and shot however many shots you want, then blip a bit more air into the gun and repeat until you are done. Then you bleed and unhook.

I do this most often with my unregulated Air Ranger with a large 580cc tank on it, shooting the flattest 10 shots from the middle of the power band. Then I reload, pop about 100 psi of air back in it, and repeat . . . . and anyone that thinks it is not safe to do this better not be filling their guns from a tank at pressure over the rated level of their gun's reservoir ;)
 
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You can get far cheaper options.

for example I have these
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Those are NOT regulators they are on off valve with no real control of the air, they will just feed tank pressure to the output
Elwood is correct those are just valves to open and close they are not regulators
50% right . The top one was ordered in error. The bottom picture at a price of $36.01 is a regulator. I was wondering why I had 2
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I have 3 scba tanks. One 30 minute and 2 60 minute. One of the 60 minute tanks used breathable air tank from a fire department that had expired. Max fill on it is 2260. I fill it to 2k and use it to tether to my 2k guns. The other 60 minute tank is a 4500 psi. I top it off to 4360 and tether it to 300 bar guns. And finally, the 30 minute tank is also a 4500 psi tank but I only fill it to 3k for the 3k guns. I can also use it on the regulated guns.. anything over the set reg pressure will keep the gun running.
That said, the only time I tether any tanks to guns is when I plan an extended shooting session. The convenience of tethering is not without draw backs.. you sure can blow through pellets when you tether a gun... 🧐
 
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I have 3 scba tanks. One 30 minute and 2 60 minute. One of the 60 minute tanks used breathable air tank from a fire department that had expired. Max fill on it is 2260. I fill it to 2k and use it to tether to my 2k guns. The other 60 minute tank is a 4500 psi. I top it off to 4360 and tether it to 300 bar guns. And finally, the 30 minute tank is also a 4500 psi tank but I only fill it to 3k for the 3k guns. I can also use it on the regulated guns.. anything over the set reg pressure will keep the gun running.
That said, the only time I tether any tanks to guns is when I plan an extended shooting session. The convenience of tethering is not without draw backs.. you sure can blow through pellets when you tether a gun... 🧐
I teether this blow through a whole can in 30 40 minutes

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If tethering is something that you will only do occasionally, then I would offer a word of caution against one of the regulated fill valves. By nature of their design, they "waste" a lot of air on every venting after a fill - so if most of your tank use is filling guns, you might be better off with an inline regulator.

With a regulated fill valve, two things lead to more air being vented to atmosphere when the line is bled. The first is that the valve opens internally to full tank pressure (unlike when we feather the valve open for a fill of a gun - when we close it, the full space inside it and the line is at the same pressure) so there is always some space that will vent off full tank pressure. The second is that they have a larger internal empty space that fills with pressure until the line is vented.

It's not like a big tank will suddenly give only a few fills, but it will "cost" a few fills off every full tank. And we can say "with our own compressor this does not matter" but it might if you spend time away from your compressor shooting elsewhere with just the tank.

I do have a regulated fill valve that use on a 500cc buddy bottle for filling my target pistol, so I know the situation is real. I also know that a great pairing with one of these is something like the Edgun EaZy fill, as it lets us avoid venting the whole line and fill valve when we disconnect the gun - use an EaZy fill with one and you'll probably come out ahead on air efficiency . . . before I added the EaZy fill the buddy bottle was almost useless as I could only get one full fill to a tiny 27cc reservoir out of it - that much air was lost to venting.
 
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If tethering is something that you will only do occasionally, then I would offer a word of caution against one of the regulated fill valves. By nature of their design, they "waste" a lot of air on every venting after a fill - so if most of your tank use is filling guns, you might be better off with an inline regulator.

With a regulated fill valve, two things lead to more air being vented to atmosphere when the line is bled. The first is that the valve opens internally to full tank pressure (unlike when we feather the valve open for a fill of a gun - when we close it, the full space inside it and the line is at the same pressure) so there is always some space that will vent off full tank pressure. The second is that they have a larger internal empty space that fills with pressure until the line is vented.

It's not like a big tank will suddenly give only a few fills, but it will "cost" a few fills off every full tank. And we can say "with our own compressor this does not matter" but it might if you spend time away from your compressor shooting elsewhere with just the tank.

I do have a regulated fill valve that use on a 500cc buddy bottle for filling my target pistol, so I know the situation is real. I also know that a great pairing with one of these is something like the Edgun EaZy fill, as it lets us avoid venting the whole line and fill valve when we disconnect the gun - use an EaZy fill with one and you'll probably come out ahead on air efficiency . . . before I added the EaZy fill the buddy bottle was almost useless as I could only get one full fill to a tiny 27cc reservoir out of it - that much air was lost to venting.
Please post links on what you recommend thanks