MAC Valve (Holley CO2 Boost Control Solenoid) 90° Mounting Bracket 21-10005
MAC Valve (Holley Boost Control Solenoid) 90° Mounting Bracket 21-10005
Running a dual solenoid boost control setup is becoming the standard across EFI systems, and boost controllers. Â However, there is always confusion on plumbing and mounting. Â It is always a pain sourcing fittings and making bracketry. Â
We decided to make it easy with this bracketry setup. Â This setup allows you to mount using bolts through sheet metal/brackets, or clamp to a chassis bar. Â Connects solid with a T, and gives inlet and outlet possibilities. Â We thought of everything with this. Â
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Included:
- Black Anodized Bracket 90°
- Hardware
- (2) bar clamps
- Nickel plated T with 1/8NPT female outlet
- Optional Solenoids (These are the exact solenoids Holley and other manufacturers use, just without their label). Â
For full plumbing questions, reference the attached diagram. Â

Want to learn how to setup and tune a boost controller? Watch this video!
Plumbing CO2 Boost? Watch this video for some awesome tips and information!
Learn how to use CO2 Boost Control
Original: $29.99
-65%$29.99
$10.50


Description
MAC Valve (Holley Boost Control Solenoid) 90° Mounting Bracket 21-10005
Running a dual solenoid boost control setup is becoming the standard across EFI systems, and boost controllers. Â However, there is always confusion on plumbing and mounting. Â It is always a pain sourcing fittings and making bracketry. Â
We decided to make it easy with this bracketry setup. Â This setup allows you to mount using bolts through sheet metal/brackets, or clamp to a chassis bar. Â Connects solid with a T, and gives inlet and outlet possibilities. Â We thought of everything with this. Â
Â
Included:
- Black Anodized Bracket 90°
- Hardware
- (2) bar clamps
- Nickel plated T with 1/8NPT female outlet
- Optional Solenoids (These are the exact solenoids Holley and other manufacturers use, just without their label). Â
For full plumbing questions, reference the attached diagram. Â

Want to learn how to setup and tune a boost controller? Watch this video!
Plumbing CO2 Boost? Watch this video for some awesome tips and information!
Learn how to use CO2 Boost Control

















