For info and to help others with ideas, here is my launcher:
Its made from some ply that i had laying around. I used 15mm copper pipe and compression fittings to 'plumb' it all together. It has a check valve (non return) to prevent water entering the air pump. It has a valve for filling / releasing pressure if needed.
Here is a picture of it pre launch:
My Hozelock / Gardena Launcher - 15mm Copper fittings
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