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ZEX Nitrous Safety Blow Down Kit w/ 2 Fittings - Installation Instructions

Installation Time

1 hours

Tools Required
  • 7/8 Deep Well Socket
  • 9/16 Wrench/Socket
  • Torque Wrench
  • Metal Drill Bit
  • Power Drill
  • Sharp Knife/Razor Blade
American Muscle
Shop Parts in this Guide


1. Remove your bottle from your vehicle

2. Using a 9/16” wrench, remove the old safety blow off valve and burst disc. The safety valve will be on the side of the bottle opposite the nitrous oxide outlet. Make sure to do this only after the bottle has been emptied.

3. Assemble the new fitting, burst disc, and washer and install on the bottle. For bottles with internal threads (such as the one used in this installation) insert the small washer into the bottle opening first, then “cap” the end of the fitting with the burst disc and start threading it into the bottle.

4. For bottles with external threads, start by inserting the large washer into the large burst disc as shown below. Next, insert the assembled washer/burst disc into the large end of the fitting with the writing on the burst disc facing outwards as shown below. Thread the fitting onto the bottle.

5. Fully tighten the fitting down to 30 lb/ft using a torque wrench. Note that you do not need to use thread sealant. There may also be some threads still exposed on the fitting. Don’t worry, the fitting is fully installed. DO NOT over tighten as you may rupture the burst disc.

6. Once the fitting has been installed, remove the bottle brackets from your trunk (if necessary) and pull your carpet back. Reinstall the brackets and place the bottle in the brackets in normal operating orientation.

7. Take the blow down tube and line it up with the blow down fitting. I used a plastic straw to extend the center point of the fitting and placed the end of the blow down tube over the straw. You can rotate the tube around until the bottom is in a suitable location to drill a hole.

8. Mark the location and use a ¾” metal drill bit to drill a hole to the outside of the vehicle. You will want to check the underside of the car to make sure the drill location is suitable before drilling. If you are unsure where the hole will come out, drill a small hole first and then check.

9. Once the hole is drilled, insert the rubber grommet.

10. Remove the bottle and bottle brackets and replace the carpet. Use a sharp knife or razor blade to cut a small hole in the carpet in the same location as the grommet.

11. Replace the bottle brackets and bottle. Insert the blow down tube through the carpet/grommet and slide the collar nut down the tube and on to the blow down fitting. Tighten the nut so that it is secure, but do not over tighten. There is no need for thread sealant.

12. Installation is complete! Reinstall your nitrous line and any other peripherals you may have. You are now ready to take your bottle fed Stang to a track!

Installation instructions provided by AmericanMuscle customer Jonathan Glennie 10.4.10

This guide applies to Vehicle years: 1979, 1980, 1981, 1982, 1983, 1984, 1985, 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014 and Submodels: Boss 302, Foxbody, Mach 1, V6, Bullitt, Cobra, GT, GT500

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