I've not seen the TD4 master, but with the Stag, the kit had a connector for the air valve on the wheel and on the other end of the tube was a cap. You take the cap off the reservoir and put on the one from the kit. I don't know if all reservoirs have a 'standard' cap or there are different kits with different caps or the kits come with multiple caps that you push the pipe onto.
There was an on/off lever to turn the air on/off.