This would be the solenoid regulator that will fit those 95gram disposable Co2 cartridges:
http://www.istaproducts.com/details+.../products/224/
Found a photo of it setup on google images:
Source: http://www.aquariumonlinestore.com.a...with-solenoid/
Not sure where you can get it locally, but i guess you could check with the shops which stock ISTA products.
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