Sentinel CO2 Regulator Expansion 

Sentinel CO2 Expansion Regulator works in conjuction with the Sentinel CO2 Regulator to connect multiple CO2 tanks together. 

By coupling CO2 tanks together, you extend the time of use between tank changes. Use with either 20 lb. or 50 lb. tank. Maximum inlet pressure 3000 PSI.

A 1/4" flexible line connects from the CO2 Expansion Regulator to the back of the CO2 Regulator. Each tank has it’s own regulator and gauge. The low pressure connection between the regulators makes installation easy and SAFE.

The Sentinel CO2-EXP CO2 expansion regulator assembly comes ready to install. Connect it to the Sentinel CO2-REG regulator, connect your second tank and you are ready to go.

Review Sentinel CO2 Regulator here.

Carries manufacturer's 3 year warranty.

More info from the Manufacturer (PDF format - Lots of detail.)