At BMS we are proud to introduce a new line of truck parts and accessories designed to save fuel and/or increase operational efficiency. To that end we have manufactured silicone CAC charge-air-cooler connectors (CAC boots) exceeding the performance of OEM CAC boots.

We know from experience OEM rubber CAC boots harden and crack over time because of the harsh conditions environment of a working truck diesel engine. When we have used silicone CAC boots they have lasted far longer reducing maintenance and down time costs.


  • Resistant to a wide range of temperatures
  • Resistant to hardening, cracking, ozone attack, sunlight
  • Resistant to moisture, steam, dust, aging, various pressure ranges
  • Resistant to many chemicals
  • Retains flexibility in hostile engine environments
  • Excellent electrical insulating properties
  • Longer life than EPDM (Black Rubber)


  • Four ply reinforcement
  • Stainless Steel Pressure Retention Rings
  • 4" diameter fits most 12 liter and higher diesel engine air induction systems


  • Temperature Range: - 65 deg. F to + 350 deg. F (177 deg. C)
  • Hose Inside Diameter: 4" (102mm)
  • Hose Outside Diameter: 4.3" (109mm)
  • Two models:
    • Length: 6.5" (166mm) - with three reinforcement rings
    • Length: 6.0" (166mm) - with two reinforcement rings
  • Reinforced Layer: 4-ply
  • Wall Thickness: 3.5mm

Silicone CAC Connector Boots From BMS:

Part Number: BMS-6003001

4" dia X 6.5" Silicone CAC Charge-Air-Cooler Connector

Selling Price:

Part Number: BMS-CAC003

Pair of 4 Inch CAC Connector Boots

Selling Price:

Part Number: bms-cac4

4" dia X 6" Silicone CAC Charge-Air-Cooler Connector

Selling Price: