Expandable Manifold Block

I purchase 3 additional expansion blocks with bubble counters. took all of 10 minutes to add them to my existing Fzone pro regulator. You just need an Allen key. One thing to note,, due to the additional weight of the added bubble counters, ensure your tank is properly secured to avoid tipping over. In my cvase I have a 5# tank.... and will be switch to a 10# in the near future.There appears to be no need for a check valve (my opinion) as the bubble counters act like one.I am now running 4 tanks with one regulator and one C02 tank. Very cost effective is operating multiple planted tanks and need C02. Better than a splitter.I highly recommend this product and will provide another review after a few more months of use.