go to rons direct....
www.ronsfuel.com
monroe is only a "dealer". (kinda like biondo for digital delay.) i had my chance to deal with him (monroe) but choose not to for various reasons that are neither here or there.
I have had 3 rons systems (2 toilets and a T2) and will only deal with rons fuel directly for these systems.
enderle has "gas" barrel valves and systems so obviously it can be done.