Mini CO2 Regulator ST-05 Description: 1. Precise adjusting valve, easily to set 1 bubble for every 2-3 seconds. 2. Using PU washer, good sealing performance. Gas service: CO2 Maximum inlet pressure: 1500 PSI Inlet gauge: 2000 PSI Inlet connection: CGA320, G1/2, G5/8, W21.8(Customizable)