They list it as can be upgraded to do it. In their buyers guide they say this is what you need:
WHAT’S NEEDED:
• Closed Pressure Transfer Kit:
• 1.5” TC Butterfly Valve (included with Flex+)
• Spike+ lid (link) Upgrade (included with Flex+)
• Gas manifold
So basically "officially" you need...
Their official list if you view the buyers guide says you must upgrade the lid to the plus model to do closed transfers. So what's the point of the 2psi rating?
I have the 3gal SS bucket right now and am definitely eying the Flex as a second fermenter and to maybe eventually do 5 gal batches. Thing stopping me is the lack of blowoff option on the non-plus model. However getting the plus model would get me closer to doing pressurized transfers later...
Buying RO water produces the same waste as making it at home. It was still made through RO. Any method of purifying water has some form of waste / energy cost. If you have the system already it seems foolish to pay a premium for RO water run through someone else's system.
If your tap water...
Why would you have any left after a month? Drink up!
I will be curious to hear how this turns out. If it's good share the whole recipe as I have been craving a strong bitter IPA.