Brass Air Dist 6-Out 3/8inB-Shutoff With Chk Brand_Chugger ensure the black rubber check

ensure the black rubber check valve (duckbill) is installed inside the gas inlet before attaching your CO2 line

Other counter pressure solutions require you to hook up a separate liquid line

" making it the ideal choice for secondary fermentation and long-term aging where small pressure changes could otherwise pull sanitizer into your beer or wine

Air Pump with pressure gauge

Brass Air Dist 6-Out 3/8inB-Shutoff With Chk Brand_Chugger ensure the black rubber checkAir Distributors Chrome Plated Brass BodyQuickly and easily convert from Right Hand Inlet to Left Hand Inlet or Passthru6 Outlets 3 8" Barb Inlet + Cap Washer to 3 8" Barb Shutoff (Outlets)Check Valve Included