: Chip, what are you using as check valves. I thought you were using backflow
: restrictors from a sprinkler system, but I was looking at the HD and they
: didn't have any (of course we're getting few inches of rain this week so
: sprinklers are useless

Hi Emmett, Seattle is dryyyyy in Summertime so everyone has lawn irrigation. I'll check the manufacturer next time I'm at HD. There's a big section of these underground lawn sprinkler systems/only one backflow preventer that I found. I snached these valves from a cardboard box of them and didn't even look at the brand name. It looks like some pool equipment might have simple PVC backflow preventers like these... milking machines was another possible source

It might be a few days but I'll get the manufacturer's name for you.