Above questions were all about Mute's bottles as we are trying to get it working again, but the bottles are well past test date, so you can see why we are stuck with 4 dia ones. Hopefully we've found some that are only a little bit bigger and weight the same.

With regards to pressure vessels, we make stuff to ASME design and covered with PED. The cost for this compared to an off the shelf, mass produced CO2 bottle would be a bit different.

Also Im guess a couple of special tanks on the market wouldn't be a problem for tech checkers but if everyone had one it would be a nightmare to check.

Hopefully see you all soon

Adam