Keep emission-system flow moving in one direction only with the Dorman - HELP Emission Check Valve, part number 355050. It is a one-way valve built as a direct replacement for the original check valve. It fits many vehicles, among them the 1988-1993 Chevrolet C1500 4.3L / 5.0L / 5.7L / 7.4L, 1988-1993 Chevrolet K1500 4.3L / 5.0L / 5.7L and 1968-1985 Chevrolet Impala 3.8L / 4.1L / 4.3L / 4.4L / 5.0L / 5.3L / 5.4L / 5.7L / 6.5L / 6.6L / 7.0L / 7.4L. See the Buyer's Guide tab for the full list of applications and engines.
Direct replacement: Designed to fit and work like the original valve on the listed vehicles.
Replaces a failed valve: Made to install in place of an original valve that has failed and to return the check-valve function to the system.
Durable construction: Made from quality materials and engineered for durability and dependable performance.
Trusted support: Backed by a team of product experts in the United States and more than a century of automotive experience.
An emission check valve lets flow pass in one direction and blocks it from reversing. Signs it may need replacing include a cracked or damaged valve body, or a valve that no longer holds against reverse flow. If a failed check valve is the cause of your emission-system problem, this Dorman valve replaces it. Diagnose the cause before replacing parts.
Material: Metal
Color/finish: Black
Inlet size: 0.75 in
Thread diameter: 0.75 in
Maximum pressure rating: 50 psi
Working temperature range: -20 to 301
Package contents: One check valve
Country of origin: China
Frequently Asked Questions
What does the Dorman 355050 emission check valve do?
It is a one-way valve in the emission system. It lets flow pass in one direction and blocks it from reversing.
What are the specifications of this check valve?
It is a black metal valve with a 0.75 in inlet size and a 0.75 in thread diameter. It carries a 50 psi maximum pressure rating and a working temperature range of -20 to 301.
What comes in the package?
The package contains one check valve. Its country of origin is China.
Does it fit the 1988-1993 Chevrolet C1500 4.3L / 5.0L / 5.7L / 7.4L?
Yes. It is listed for the 1988-1993 Chevrolet C1500 4.3L / 5.0L / 5.7L / 7.4L and the 1988-1993 Chevrolet K1500 4.3L / 5.0L / 5.7L. Check the Buyer's Guide tab for other vehicles.
What are signs an emission check valve may need replacing?
Signs include a cracked or damaged valve body, or a valve that no longer blocks reverse flow. Diagnose the cause first, since other emission parts can cause similar symptoms.
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WARNING:
These products can expose you to chemicals including lead and phthalates, which are known to the State of California to cause cancer and birth defects or other reproductive harm. For more information go to
www.P65Warnings.ca.gov.
