[BNelly13]

Since we are talking about the relay which part inside of it is the piston? I've watched videos but am still unsure. Is it the large brass piece that comes out last?

[Dirty J]

The piston is the large brass cylinder with 2 orings on it. It's on the front (vel. adjuster) side of the reg. To access it, you'll need to unscrew the reg pin from the back side, with your 3mm nut driver.

[BNelly13]

Originally Posted by Dirty J

The piston is the large brass cylinder with 2 orings on it. It's on the front (vel. adjuster) side of the reg. To access it, you'll need to unscrew the reg pin from the back side, with your 3mm nut driver.

Thank you. I thought that was what it was but couldn't find a parts diagram to confirm that.