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wagoon

Power valve sizing

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Can someone identify the difference (if any) between these 2 power valves please. The thing I don't understand is that one has the numbers 3 5 3 stamped on it while the other one has 3 5 7, both have the letter A stamped on them as well. I'm guessing that they are both 3.5 power valves but the fact that they are stamped differently has me scratching my head wondering if there is something else to it.

20160803_142309_zpsqdzbl63q.jpg

 

The double stamping makes it a bit harder to read this one

20160803_141803_zpsnq3p5dn1.jpg

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All the ones I have bought of late have been stamped like the ones in wagoon's photos. Must be easier and quicker for them to stamp them like that than on the side like they use to.

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