This is not a JG, John Guest Speedfit fitting but is compatible. Need it in a hurry?. Fits 5/16 or 8mm MDP or Eva hose.
Non Return Valve One Way SCV 5/16 8mm Push Fit 5 Pack Compatible JG John Guest
Non Return Valve One Way 1/4 6.35mm Push Fit Compatible JG John Guest speed fit
Corny Keg Gas Ball Lock Disconnect - Non-Return Check Valve - JG 3/8" Push-Fit
4" Cap with S30 Valve for Homebrew King Keg Pressure Barrel (Non Piercing Pin)
2" Pressure Barrel Cap With S30 Valve (Non Piercing Pin) For Homebrew Beer Kegs
S30 Co2 Pressure Top Up Valve (Non Piercing Pin Type) For Beer Barrel