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Jack,
if you make the squirt nozzle e.g. 1/8" OD and the valve opening 5/32" and use a thin tubing it will contract to less than 5/32" if you let it extend over the squirt nozzle, sealing against the chamfer. This was how I used it at first. Then I ran out of the thin tubing and replaced it by the thicker one. Now the seal is made by kind of a longitudinal compression of the tube. This seems to work also. An O-ring may also be an alternative.
Regards
 
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