Gates EMH703 Engine Crankcase Breather Hose - PCV Valve To Intake or Valve Cover To Intake

OE-Exact Crankcase Breather Hose

Gates EMH703 is an OE-exact engine crankcase breather hose for emission control and PCV routing. Built from durable plastic with a clip-on end, it restores the factory-style connection between the PCV valve and intake system on select Chevrolet Silverado, Silverado 1500, Tahoe, GMC Sierra, Sierra 1500, Yukon, and Yukon XL applications.

The Gates Emission Control Hose line focuses on direct-fit replacement hoses that match original routing and connection style. EMH703 follows that approach with OE-style dimensions, a protective sleeve, and the correct connector design for service replacement on supported vehicles.

• OE-exact replacement for crankcase ventilation and emission control routing
• Plastic construction for factory-style fit and service use
• 10 mm inside diameter with 343 mm centerline length
• Clip-on end type for the specified application
• Protective sleeve included for added hose protection
• Direct replacement for select GM PCV and intake hose routing

Detailed Product Overview

This Gates EMH703 emission control hose is built to replace the original crankcase breather hose used in PCV-to-intake and valve cover-to-intake routing. It is engineered to restore proper emission system operation by matching the OE layout, connection style, and hose dimensions required on the listed Chevrolet Silverado, Silverado 1500, Tahoe, GMC Sierra, Sierra 1500, Yukon, and Yukon XL applications. This part cross-references GM OE numbers 12664931 and 12708531 for the same application.

Common Problems This Hose Can Address

• Cracked or brittle crankcase breather hose
• Loose or damaged clip-on hose connection
• Vacuum leaks in the PCV-to-intake path
• Emission system fault caused by deteriorated hose routing
• Oil vapor or crankcase ventilation flow issues from a worn hose

Installation Notes and Tips

Verify the vehicle’s hose routing, connector style, and position before installation. This part is listed for PCV Valve To Intake (Left Side) and Valve Cover To Intake applications on specific model years, including 2025 Chevrolet Silverado and Silverado 1500, 2025 Chevrolet Tahoe, 2023-2025 GMC Sierra, Sierra 1500, Yukon, and Yukon XL, plus earlier Silverado 1500, Sierra, Tahoe, Yukon, and Yukon XL configurations with 10 mm connector requirements where noted. Confirm the original hose length and end type against the removed part before service.

Quality Assurance

Gates manufactures this hose as part of its Emission Control Hose line, using OE-exact construction and durable materials to match factory replacement requirements. EMH703 is built for direct-fit service on the listed applications and is intended to restore the emission hose connection to proper operation.