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Old 02-27-2015, 02:00 AM #1
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Piston o ring sizes and type

Can't really get a 100% answer. I'd like to sell these separately at my shop to customers who need their regs rebuilt. Now to my knowledge, there are three o-rings for the pin style ninja regulator pistons, and two o-rings on the piston for the ball style ninja regulator pistons. My question is, what type of orings? (Urethane I believe), and what are the sizes of the o-rings, on each style of regulator? Thanks!

- Matt
2656 Porter Road
Bear, Delaware
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Old 02-27-2015, 11:34 AM #2
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Old 02-27-2015, 12:47 PM #3
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I believe the o-ring sizes are:

Pin valve seat is a -006 Teflon
The smaller piston oring is a -008 polyeurethane in a 90 duro
The two larger piston orings are -012 buna in a 90 duro or 70 duro - However, I seem to recall that on my Pro regs, these larger piston o-rings were polyurethane.

I think those sizes are at least for the standard adjustable regs. There is likely a difference for the Pro V2, at least for the one in the top of the bonnet for the ball valve.
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