They are made by Spears, and are a superior valve.
They are a little more expensive,but they are much easier to tweak.
Here they are available at Southern drip irrigation,but you must have a buiness account to purchase from them.
Im not sure of others who carry them, but i definatly dont regret replacing all my old red ones with them.
You wouldnt be dissapointed if you made the effort to get them.
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Confucious say : Things that come to those who wait, will be things left over by those who didnt.
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