BK Racing F23 Transmission Cap AN-4 Adapter – Clean Vent & Breather

Upgrade your Getrag F23 transmission with the BK Racing Transmission Cap AN-4 Adapter — the best AN-4 vent cap for F23 manual transmissions, providing a secure, leak-free AN-4 male connection for custom breather lines, catch cans, or vent-to-atmosphere setups. This precision-machined adapter replaces the factory plastic vent cap, allowing easy routing of braided hose for improved crankcase ventilation in high-performance or race applications — trusted for Cobalt, Cavalier, HHR, Ion, Solstice, and F23-swapped Ecotec builds.

CNC-crafted from billet aluminum with black anodized finish, this adapter ensures durable sealing while supporting high-flow venting to prevent pressure buildup and oil leaks during hard launches or track use.

Key Features:

• AN-4 male flare for direct braided hose connection
• Billet aluminum construction with O-ring seal for leak-free performance
• Direct replacement for factory F23 vent cap
• Knurled edge for easy hand installation/removal

Performance Benefits:

• Cleaner crankcase venting for reduced pressure and oil blow-by
• Supports remote catch can or filtered breather setups
• Prevents common factory cap failures or leaks in modified transmissions
• Improves transmission longevity in high-power or track applications
• Pairs perfectly with BK Racing F23 traction blocks, seals, and drivetrain mounts

Compatibility:

• Getrag F23 5-speed manual transmissions
• GM Ecotec-powered vehicles:
  • Chevrolet Cobalt (base models), Cavalier, HHR
  • Pontiac Sunfire, G5, Solstice (non-GXP)
  • Saturn Ion (non-Redline), Vue
  • Custom F23 swaps and related platforms

Important Notes:

• AN-4 hose and fittings sold separately
• Route vent line away from heat/exhaust for best results
• Off-road and competition use only

Installation Note: Hand-tighten until O-ring seats. No tools needed for normal use. Professional routing recommended for vent lines.

Proudly engineered by BK Racing Inc. — transmission specialists providing reliable venting solutions for maximum performance and durability.

Vent smarter — add the BK Racing F23 Transmission Cap AN-4 Adapter to your build today!