This Mini CO2 regulator features a 6.35mm duotight compatible barb, meaning you can connect just about anything within a matter of seconds.
The most common easy attachment to your ball lock kegs would be adding 1 x KL24242duotight 6.35mm (1/4) x Ball Lock Disconnect – (Grey + Red Gas)

If however you want to be a bit more protective with your beer not shooting back into the regulator you could minimise the damage by using a 6.35mm check-valve and some hosing to your ball lock disconnect.

Mini CO2 Regulator is suitable Gas Cartridges are:
KL06149 (10 Pack) 16g Cartridge / Bulbs
KL1688974g Big Bulb CO2 Cartridge 5/8-18UNF Thread

To use the Mini duotight Regulator with threaded (not QD) Sodastream cylinders you will need the optional KL43236 Deluxe Sodastream Cylinder Adapter for Mini duotight Regulator

This Mini duotight Regulator also will work on conventional larger CO2 Cylinders with Type 30 Thread. So if you wanted to connect this regulator to your 2.6kg or 6kg CO2 cylinder then you can use this Type 30 Adaptor for Mini duotight Regulators.

Please note, once you get liquid shoot back through it, it’s no longer functional. Be extremely careful with overfilling your kegs or tipping them over when the gas has run out.

This regulator is capped at dispensing 45psi to ensure you do not accidentally over carbonate or exceed your kegs pressure rating.

The gauge however shows up to 60psi just in case by heat ingress / expansion that it does not break the gauge.