I have a zex nitrous bottle and was going to mount it while I was doing the fuel pump so I for sure wouldn't drill into the gas tank and needed to know before I order a blow down kit if it matters what brand. The nitrous express one is the cheapest @ 20 bucks and was wondering if it would work with the Zex bottle.

 

connections are mostly the same for this part of the bottle...
The blow down is going to be what one you want...

I did a bulk head with hose and it was right at about 20 bucks..
plus I liked the way the bulk head looked compared to the blow down...
IMO

 

HSW has a GREAT deal on the tubes, and the adapter that you need as well. The real difference in the tubes is the angle, some make a U where others are a 90* bend like a L, just put your bottle in the car as it will go and see if you will need the U shape or the L shap