Square-Drive Bottle Knob
Get a solid grip and look good
Bottle Knobs
Pro-Werks Billet Aluminum Bottle Knobs — CO2 & Nitrous Valve Knobs
Get a solid grip on that bottle with a Pro-Werks Bottle Knob. Precision CNC machined on MAZAK machining centers from American melt, aircraft-grade 6061-T6 aluminum — then finished in your choice of anodized black, anodized silver, or micro-polished aluminum. Deep, comfortable finger notches match the rest of the Pro-Werks lineup of Easy Turn Fill Caps and aluminum knobs.
Available in two square drive sizes to accommodate the valves found on most CO2 and nitrous cylinders. Before ordering, remove your original knob and measure the square drive of your bottle valve to confirm your size.
- Bottle Valve Knob — 0.290" Square Drive — Polished, Black Anodized, or Silver Anodized — Pro-Werks Square Drive Billet Aluminum Bottle Valve Knob — Made in USA
- Bottle Valve Knob — 0.320" Square Drive — Polished, Black Anodized, or Silver Anodized — Pro-Werks Square Drive Billet Aluminum Bottle Valve Knob — Made in USA
Pro-Werks 360° Secure Bottle & Bar Mounts
Full-circle contact, precision machined to apply equal pressure around the bottle or tube being secured. Modular design — use individually or together. All machined in Michigan from U.S. melt, aircraft-grade 6061-T6 aluminum on MAZAK CNC machines, detailed to a jewelry-quality finish. Approved and required by most sanctioning bodies (including NASCAR) for fire bottle mounting. Two mounts per bottle recommended. Measure your bottle before ordering — clamping range is less than 1/16". Made in USA
- Modular Bottle Mount with Easy Spin Knob — 7 Sizes (2", 3.2", 4", 4-1/4", 4-3/8", 5-1/4", 6.9" Dia.) — Polished or Brilliance Black — Pro-Werks Billet Aluminum Modular Bottle Mount — CO2, nitrous, fire suppression, and fresh air bottles
- Lightweight 2" Bottle Mount with Easy Spin Knob — Polished or Brilliance Black — 1/4"-20 Holes on 1-1/2" Spacing, 3/8" Thick — Pro-Werks 2" Lightweight Billet Aluminum Bottle Mount — fits 10 oz CO2 bottles and small nitrous cylinders
- Bar Mount — 11 Sizes (3/4" to 2" Dia.) — Polished or Brilliance Black — Clamps to Tube Without Welding — Pro-Werks Billet Aluminum Bar Mount — mount base 3-7/16" wide, 1/2" thick, 1/4" bolt spacing 2-5/8"
- Universal Clamp — 5 Sizes (1.910", 2.010", 2.437", 2.500", 3.000" Dia.) — Polished or Brilliance Black — Pro-Werks Billet Aluminum Universal Clamp — Penske #8100, Fox, King, Sway-a-way shock reservoirs; fuel pumps, exhaust, catch cans
- Neck Mount — 5 Sizes (1.215", 1.300", 1.525", 1.600" Neck) — Polished — For Fire Extinguisher Cylinder Neck Clamping — Pro-Werks Billet Aluminum Polished Neck Mount — fits 3.55", 4", 4-1/4", and 5-1/4" diameter bottles; pairs with Pro-Werks Bottle Mounts
Complete Your Build
- Access Door Kits — aeronautical-style aluminum access doors for quick access to CO2 or nitrous bottle knobs through body panels
- Bar, Bottle & Universal Mounts — full lineup of bottle and tank mounting hardware to secure your CO2 and nitrous cylinders
- Fill Caps & Bungs — Pro-Werks Easy Turn billet aluminum fill caps that match the finish and style of your bottle knob
Proudly Made in the USA.









