Theoben Rapid Forum

Airguns => Anything Airgun => Topic started by: WoolwichWarrior on August 05, 2025, 02:36:17 PM

Title: Air Tank guidance needed
Post by: WoolwichWarrior on August 05, 2025, 02:36:17 PM
Stupid question alert!

I'm new to air tanks. Always used a scuba shop before but having moved I am going to buy a 12L tank to fill bottles on an old Rapid MkII and a much younger FX Impact MkII.

I want to buy the right product to do both but I've no clue on pressures, or sellers.

What should I be considering?
Who should I be buying from?

Forgive the novice Q but better safe than exploded! 💥 
Title: Re: Air Tank guidance needed
Post by: Ca_Varminter on August 05, 2025, 04:15:44 PM
`Go with a  310Bar/4500psi Carbon-Fiber Tank!!
This will allow more fills of your PCP before the Tank needs to be refilled!!
(https://photos.imageevent.com/scl_electronics/gun/compressor/websize/88-17_small.jpg)

Then if you want to go Wild....Get a Compressor to fill it!!
(https://photos.imageevent.com/scl_electronics/gun/compressor/websize/full.jpg)

Stuart
Title: Re: Air Tank guidance needed
Post by: Squinty on August 05, 2025, 07:46:56 PM
https://airriflemainsprings.co.uk/12l-midland-diving-mde-12-litre-airgun-charging-kit-with-boot-and-300bar-cylinder-complete-supplied-empty

https://www.bestfittings.co.uk/shop/airgun-charging-equipment/cylinder-accessories/12-ltr-steel-300bar-airgun-charging-cylinders/

https://solware.co.uk/300-bar-12ltr-charging-cylinder-with-gun-valve-gauge



Title: Re: Air Tank guidance needed
Post by: WoolwichWarrior on August 05, 2025, 10:23:50 PM
This is really helpful, cheers.

Not sure I'm into compressor territory yet!

But steel 300bar should do the trick.

What about hoses?

From what I read the Rapid and the impact may need different ones, ie 1/8 or 1/4?
Is that the case or can one hose 'rule them all' with the right adapter?
Title: Re: Air Tank guidance needed
Post by: Ca_Varminter on August 06, 2025, 12:31:21 AM
Nope...
So are using a QF setup on your Rapid??
If so, both will use a Foster QD socket...
(https://photos.imageevent.com/scl_electronics/gun/qf/websize/20150607_091816.jpg)
(https://photos.imageevent.com/scl_electronics/gun/fxm3/websize/20221021_160152.jpg)

Both use 1/8" BSPP hose with a long reach Fosters QD Socket..

Good Luck,
Stuart
Title: Re: Air Tank guidance needed
Post by: Squinty on August 06, 2025, 04:44:55 PM
Quote from: WoolwichWarrior on August 05, 2025, 10:23:50 PMThis is really helpful, cheers.

Not sure I'm into compressor territory yet!

But steel 300bar should do the trick.

What about hoses?

From what I read the Rapid and the impact may need different ones, ie 1/8 or 1/4?
Is that the case or can one hose 'rule them all' with the right adapter?

https://airriflemainsprings.co.uk/12l-midland-diving-mde-12-litre-airgun-charging-kit-with-boot-and-300bar-cylinder-complete-supplied-empty

12 Litre 300 Bar Steel Cylinder

Valve with built in gauge and bleed

Hose - 1/8 BSP Female Fitting

1/4 BSP Fitting in adaptor when hose is removed for BSA / Theoben (Shim required)

PLEASE NOTE

the Rapid bottle valve has the same 1/4 BSP thread as the dive cylinder adapter and can screw in directly to the cylider

just a delrin spacer to seal the buddy bottle valve in the 1/4BSP reducer..or you can but an adapter to fit the hose

should have a fill adapter for your FX quick fill already.
Title: Re: Air Tank guidance needed
Post by: Ca_Varminter on August 06, 2025, 05:06:15 PM
So if you are going to fill your Rapid bottle directly...
Here is a 1/4" bspp adapter that seals on the neck O-ring.
Also has a foster QD fitting so you can still use
the fosters socket that you use on your Impact....
(https://photos.imageevent.com/scl_electronics/gun/air/websize/_DSC0018.JPG)

Stuart
Title: Re: Air Tank guidance needed
Post by: rapidave on August 07, 2025, 05:34:00 AM
that is great info and with photos as well thank you CA-Varminter
that has helped me with my thoughts about that
Many thanks CA-Varminter