For crude control, you can get shut off clamps from a chemistry lab
place. Looks like a mini C clamp, but two flat surfaces.
Or, you can get an inline globe valve for water copper, from Home Depot.
Compression fitting clamp onto two pieces of 1/8 water copper (which is
1/4 OD) and then slip the hose clamp over the copper. Couple spiral
clamps to hold the hose onto the copper.
Christopher A. Young
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I have some 1/4" OD flexible plastic tubing I wish to control water flow
though. All I can think of offhand is two large flat washers with a nut
bolt straddling it and squashing the line between the washers to control
the flow. Haven't tried this yet so don't know if it will work.
Any better ideas? It is out of sight so need not be pretty. Any
"Where there's smoke there's toast!" Anon