Look what ive sourced...neat little check valves - fit right inside a 3mm silicon hose.



http://www.face2faces.co.uk/RX7/checkvalve.jpg



Will let you know how they work https://www.nopistons.com/forums/pub...#>/biggrin.png May start to sell them if they work well. $5 each isnt unrealistic.

Good stuff! Let us know!