This is the o-ring kit for G1 kettles. I got these and was surprised when I received them that is clearly states on the packaging they are for G1 kettles but it wasn't indicated on the website anywhere. The difference is you will have the o-rings for the 3 piece valve but you will be missing the two linear flow valve o-rings.....and it doesn't appear like OBK sells those either. I'm a bit annoyed by this because I wouldn't have ordered this G1 kit from OBK had it been disclosed, I would have just ordered the G2 kit directly from Blichmann and got everything I needed without having to spend more money and search for the parts I thought I was already paying for.