Ista bottles/regulator how to identify thread type? Sodastream conversion?

neofy705

New Member
Joined
21 Nov 2020
Messages
5
Location
Birmingham
Hello all,

Long time lurker first time poster This is my first time using pressurised CO2 in my tanks.
I bought an ista pressurised system off marketplace for £30 which i thought was amazing value. The "premium" ista kit, it has a 0.5L refillable cylinder, a solenoid etc.

The system worked beautifully in my 54L tank... until it needed a refill.
The bottle clearly states 5/8-18UNF (same as disposable 95g) so I bought a sodastream to nano adaptor and a sodastream cylinder and it turns out the ista bottle is clearly not 5/8-18 unf, using a ruler the thread measures 21-22mm much bigger than what a 5/8-18UNF should be.

Does anyone have any experience with the ista setup? What do I do now?
Does anyone know what the ista bottles/regulator thread type is?
I asked a number of retailers/sellers and they all said it's din477 but a quick search here shows quite a few members had incompatibility issues.
I'm on a budget and I've already wasted £35 on a sodastream conversion that failed.

As I'm only running 1 bubble per 3 seconds I thought a sodastream would be ideal for me.
But now I don't know what to do. Options:
1) Send the ista bottle for a refill via someone i found on ebay (£15) and have no co2 for a week?
2) find an adaptor that can make my regulator use sodastream? I can find DIN477, CGA320, G5/8 but which one is it? And will it work or is my regulator only compatible with insta cylinders so option 1?
3) try all possible adaptors (between 20-22mm) with the risk of just wasting another £30?

Any help will be greatly appreciated.
 

dcurzon

Member
Joined
4 Jul 2020
Messages
187
Location
Essex
Standard UK fire extinguisher is w21.8 which sounds like what you have there.
Either pick up a co2 fire extinguisher, my last one was £15 delivered (2kg), or pick up a w21.8 to sodastream adaptor, which will be about a tenner.
(And handy to have around anyway)
 

neofy705

New Member
Joined
21 Nov 2020
Messages
5
Location
Birmingham
Thank you, dcurzon. The thing is I'm not sure if my bottle is w21.8. It could be a cga320 or a non standard one. The inside of the regulator looks like it has something. Do the male and female parts look like a w21.8 to you?
 

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