HD and Lowes suck imo, for valves and such there are a few websites which are good, I don't recall the exact site but a quick Google search should result in a "pvcfittings.com" or something which should be fine.
I went with schedule 80 valves because they're disassemble-able if the ever get clogged, and those aren't available at HD, but if you're just looking for schedule 40 quarter turn valves you might be able to find them at HD and save on shipping
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