An interesting DDR combi set. Cylinders are currently empty. Looking forward to getting this one running.
I must admit, having evidently caught the 'gassie' collecting bug that I thought only me, Hikin Jim and one or two others have, you've tracked down a belter there Ian! I'd be interested to see what sort of screw connector the cylinders have, though the hose clamp on the control valves fitting suggests a hose barb's at the core. Easy enough to pop a hose from a propane cylinder/regulator onto that and you've got your refilling rig. John