What part number are you referring to? Look it up on the exploded parts diagram on the ys performance site and i'll tell you what you need to know.
I suspect that the part you lost is not the diaphragm because it is large enough to be seen from 10 feet away!
The check valve is the metal thing that attaches to the air line from the fuel tank. It enables pressurization which is needed to a supercharged engine like the ys. It is a small metal cylinder with nipples on both ends for attaching to the tubing. Inside of it is a small plastic element (diaphragm, I guess) that is supposed to let air flow in one direction easier than the other.
Central Hobbies sells the valve for $7.75. The shipping, of course is extra. They kinda make up for it with their prices on OS F plugs and/or APC props. Order the valve and a couple of plugs and the savings on the plugs pays the shipping.
JR
You are right. I was picturing the regulator, DUH.
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