Product Description
Four Seasons 74781 Vacuum-Operated Bypass Heater Valve
The Four Seasons 74781 is a vacuum-operated bypass heater valve designed to regulate coolant flow and optimize cabin heating performance in heavy-duty applications. This valve automatically responds to engine vacuum signals to control heater core bypass, improving thermal efficiency and reducing energy waste.
Key Features
- Vacuum-operated design for automatic bypass control
- Regulates coolant flow to heater core based on engine demand
- Improves cabin heating efficiency and response time
- Direct replacement for OEM heater control valves
Specifications
| Brand | Four Seasons |
| Part Number | 74781 |
| Weight | 0.3 lb |
| Dimensions (L × W × H) | 8.9 × 4.3 × 4 in |
| UPC | 096361747814 |
⚠️ Prop 65 Warning
WARNING: This product can expose you to lead, nickel, and other chemicals, which are known to the State of California to cause cancer and/or birth defects or other reproductive harm. For more information go to www.p65warnings.ca.gov.
