Add Co2 to your pinter if it loses pressure, this can often happen. Screw the canister in tightly, screw the red knob to break the canister seal and the gas with provide the pressure.
Co2 Carbonation Device
304 Stainless Steel Counter Pressure Beer Bottling Device Co2 Carbonation Kit Food Grade Beer Gun Hand Held Bottle Filler,
Hand Held Bottle Filler, Homebrew Counter Pressure Beer Bottling Device Co2 Carbonation Kit,
Stainless Steel Double Ball Lock For Mini Keg Dispenser for Homebrew Beer, 60PSI Carbonation Device with Hose and Gaskets, Compatible with 2L to 10L Cornelius
Device for the production of beer foam, ultrasonic compact device for ventilation and output, machine for producing beer foam, quick drink foam dispenser for garden, patio, picnic and parties
Homebrew Kegging CO2 Carbonation Kit, Hand Held Bottle Filler, Handheld Easy Beer Filling Bottling with Swing Caps