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I know they changed the cylinder cam band to a new style.
So FYI, I just got off the phone with Aqualung and they said any new Zuma BC that is purchased right now is coming with 840D material. Something about they currently are out of the 420D they were using on the 2013 model. (This came from Brian) at AL who I spoke to. He said they are out of the 420D so they are using the higher material just right.
Picked mine up today. Is there a way to tell which material it is?
Hoping to try it out this weekend.