How can you tell the difference between a zex wet kit and dry kit? I'm talking about the purple control unit. Is there a visible difference between the two? I'm looking to buy one but the guy doesn't know if it is wet or dry. Thanks.

 

Easiest way to tell on a ZEX system is look at the nozzles. ZEX Dry kit will have a nozzle with a sigle line connection (nitrous only). ZEX Wet kit will have a nozzle with two line connection(one for nitrous one for fuel).
Dry Kit
Wet Kit