I use DIG 1/2" polypropylene with .700" ID, take 500 foot for example Reels from Home Depot These valves are too small and don't grip the pipe well enough to prevent water from leaking or sliding out of the pipe, and at a very low system pressure - any actual pressure and they would go right there so isn't necessarily a problem but does mean I had to use 2x clamps on each of them and they cost the same as the valve compared to DIG brand valves (which grab the pipe - you have to cut it off each time) which each cost about $2.50 They were more expensive after the clamps.
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