Home > Diesel Engine Parts > Pressure Relief Valves > 3963808 Part #3963808 — Pressure Relief Valve CUMMINS PRESSURE RELIEF VALVE 3963808 — OEM REPLACEMENT The Cummins Engine Pressure Relief Valve 3963808 is a precision-engineered replacement component designed for ISC, ISL, QSC, and QSL diesel engine platforms. Manufactured by CHINA EVERLASTING PARTS CO., LIMITED, a professional high-quality engine parts and filters manufacturer, this valve delivers OEM-equivalent performance at a competitive Pressure Relief Valve Price point. Our facility specializes in air filters, oil filters, hydraulic filters, fuel water separators, and precision diesel engine components — with full OEM & ODM service capability. ✅ Cross Reference: This valve matches Cummins Pressure Relief Valve Cross Reference part number 3963808 and is fully interchangeable with OEM specifications for seamless installation. Product Features — Cummins Pressure Relief Valve 3963808 The Cummins Engine Pressure Relief Valve 3963808 is constructed using high-grade alloy steel and precision-machined internal components to ensure consistent pressure regulation under the most demanding diesel engine operating conditions. This replacement valve is engineered to match the exact dimensional tolerances and flow characteristics of the original Cummins part, providing a direct bolt-on installation without modification. Part Number: 3963808 Brand: Cummins Replacement (Aftermarket OEM Quality) Material: High-strength alloy steel body with hardened internal spring mechanism Operating Pressure Rating: Calibrated to OEM factory specifications Finish: Anti-corrosion zinc-nickel coating for extended service life Precision Fit: CNC-machined threads and sealing surfaces for leak-free installation Quality Control: 100% pressure-tested before shipment to ensure consistent performance Packaging: Individually sealed in anti-static protective packaging with holographic authenticity label Product Advantages — Why Choose Our OEM Pressure Relief Valve Compared to purchasing directly from authorized Cummins dealerships, our OEM Pressure Relief Valve offers a significant cost advantage without compromising quality. The Pressure Relief Valve Replacement Cost is typically 40–60% lower than genuine dealer pricing, making it an ideal choice for fleet operators, independent repair shops, and wholesale parts distributors looking to maximize their margins while providing reliable components to their customers. Competitive Factory-Direct Price: Eliminate middleman markups with our manufacturer-direct pricing model. Compare our Pressure Relief Valve Price with dealer quotes and save immediately. OEM & ODM Customization: We offer custom branding, private labeling, and design modifications to meet your specific market requirements. Your logo, your box, your specifications. Low Minimum Order Quantity (MOQ): Start with just 10 pieces to test the market. Ideal for retailers, distributors, and service shops building their inventory. 12-Month Warranty: Every valve is backed by a comprehensive 12-month warranty against manufacturing defects, giving you and your customers peace of mind. Fast Global Shipping: With established logistics partnerships, we deliver to North America, Europe, Southeast Asia, and beyond within 7–15 business days. Dedicated B2B Support: A dedicated account manager is assigned to every wholesale, distributor, and OEM client for streamlined communication and order processing. Customer Benefits — What This Means For Your Business When you source the Cummins Pressure Relief Valve 3963808 from China Everlasting Parts, you are not just purchasing a component — you are building a supply chain advantage that impacts your bottom line. Here is how our clients benefit: Lower Total Cost of Ownership Reduce your Pressure Relief Valve Replacement Cost by up to 50% while maintaining OEM-grade quality, directly improving your service margins and competitiveness. Reduced Engine Downtime A properly functioning Pressure Relief Valve prevents over-pressurization damage. Our valves ensure your customers' equipment stays operational longer. Flexible Scaling & Customization From 10-piece trial orders to full container loads with custom branding, our OEM Pressure Relief Valve program grows with your business. Product Specifications — Cummins Pressure Relief Valve 3963808 Parameter Specification Part Number 3963808 Part Type Pressure Relief Valve Brand Cummins Replacement (Aftermarket OEM Grade) Application Cummins ISC, ISL, QSC, QSL Diesel Engines Minimum Order Quantity (MOQ) 10 Pieces Material High-Strength Alloy Steel, Zinc-Nickel Coated Pressure Calibration OEM Factory Specification (Certified Test Report Available) Service OEM & ODM — Custom Branding, Private Label, Design Modifications Warranty 12 Months Against Manufacturing Defects Net Weight (per unit) Approx. 0.35 kg (0.77 lbs) Packaging Individual Anti-Static Sealed Bag + Protective Box (Custom Packaging Available) Lead Time 3–5 Business Days (Stock Orders) / 15–25 Business Days (Custom OEM Orders) Verified Customer Reviews — What Our B2B Clients Say ★ ★ ★ ★ ★ "We ordered 200 units of the 3963808 valve for our fleet maintenance program. The Cummins Pressure Relief Valve Cross Reference was spot-on — direct bolt-in, zero leaks, and our techs couldn't tell the difference from dealer parts. The Pressure Relief Valve Price saved us over $4,200 compared to our previous supplier. This is now our go-to source." — Michael T., Procurement Manager Diesel Parts Wholesale Co., Texas, USA ★ ★ ★ ★ ★ "As an independent repair shop, we rely on quality aftermarket parts to stay competitive. The Cummins Engine Pressure Relief Valve from China Everlasting Parts has exceeded our expectations. We've installed over 80 units without a single warranty claim. The OEM & ODM option also lets us offer our own branded line to customers." — Sandra R., Owner Heavy Equipment Maintenance LLC, Ohio, USA ★ ★ ★ ★ ★ "We service a mixed fleet of ISC and ISL engines across three states. The 3963808 valve has become our standard replacement part. The team at China Everlasting Parts provided detailed Pressure Relief Valve Change instructions and always ships within 48 hours. Their WhatsApp support is incredibly responsive — even late at night our time." — David L., Operations Director Fleet Truck Service Center, California, USA Pressure Relief Valve Change — Installation Guidance for Professionals Performing a Pressure Relief Valve Change on Cummins ISC, ISL, QSC, or QSL engines requires attention to torque specifications and proper sealing techniques. The 3963808 valve is designed for a straightforward swap-out process that experienced diesel technicians can complete in approximately 30–45 minutes. Here are the key steps we recommend: Ensure the engine is fully cooled and the system is depressurized before beginning any service work. Locate the pressure relief valve housing on the engine block — typically near the oil filter assembly or high-pressure fuel rail. Clean the surrounding area thoroughly to prevent debris from entering the system during valve removal. Remove the old valve using a properly sized socket. Inspect the mating surface for wear, gouges, or corrosion. Install the new Cummins Engine Pressure Relief Valve 3963808 with a new copper or composite sealing washer as applicable. Torque to OEM specifications (contact our support team for detailed torque charts for your specific engine model). Start the engine and verify proper oil/fuel pressure readings. Check for any leaks around the valve seat area. Note: Always consult the engine manufacturer's service manual for model-specific procedures. China Everlasting Parts provides free technical documentation and video support for all wholesale and distributor clients. Frequently Asked Questions (FAQ) 1. What is the minimum order quantity for the Cummins Pressure Relief Valve 3963808? The MOQ is 10 pieces. This low threshold allows retailers, repair shops, and small distributors to test the product quality in their local market before committing to larger volume orders. For custom OEM/ODM orders, the MOQ may vary based on branding and packaging requirements. 2. Is the 3963808 valve a genuine Cummins part or aftermarket? This is a high-quality aftermarket replacement manufactured by China Everlasting Parts Co., Limited. It is engineered to meet or exceed OEM performance specifications and is fully interchangeable with the genuine Cummins part number 3963808. We are not affiliated with or endorsed by Cummins Inc. — the term "Cummins" is used solely for compatibility reference purposes. 3. What is the typical Pressure Relief Valve Replacement Cost comparison? Genuine dealer pricing for this part typically ranges from $85–$140 USD per unit. Our factory-direct Pressure Relief Valve Price for bulk orders is significantly lower — often 40–60% less — depending on order volume and customization requirements. Contact our sales team for a detailed quotation based on your specific quantity. 4. Do you provide OEM/ODM services for this product? Yes, absolutely. As a professional manufacturer, we offer full OEM Pressure Relief Valve services including custom branding (laser engraving of your logo), private label packaging, custom color finishes, and design modifications to meet specific performance requirements. Our engineering team works closely with clients to develop custom solutions tailored to their market. 5. Which Cummins engines are compatible with this pressure relief valve? The 3963808 valve is specifically designed for Cummins ISC, ISL, QSC, and QSL diesel engine platforms. These engines are commonly found in medium-duty trucks, buses, construction equipment, marine vessels, and industrial power generation units. If you need a Cummins Pressure Relief Valve Cross Reference check for a different engine model, contact our technical support team. 6. How long does shipping take for international orders? Standard international shipping via air freight typically takes 7–12 business days to major markets in North America, Europe, and Southeast Asia. Express shipping options (DHL, FedEx, UPS) are available for 3–5 business day delivery. Sea freight is recommended for large volume orders to reduce shipping costs — transit time is approximately 25–35 days depending on destination port. Get a Quote — Contact Our B2B Sales Team Ready to place an order or request a sample of the Cummins Pressure Relief Valve 3963808? Our B2B sales representatives are available 7 days a week to answer your questions and prepare a detailed quotation. WhatsApp: +86 18965520297 WeChat: +86 18965520297 Email: Sales@parts-machining.com Company: CHINA EVERLASTING PARTS CO., LIMITED — Professional High Quality Filters ManufacturerAir Filter | Air Cleaner Filter | Air Dryer | Ventilation Filter | Breather Filter | Oil Filter | Fuel Filter | Hydraulic Filter | Fuel Water Separator | Air Oil Separator | Filters Assembly | Diesel Engine Parts © 2025 China Everlasting Parts Co., Limited. All rights reserved. | OEM & ODM Manufacturer of High-Quality Filters & Diesel Engine Components Product images are for reference only. Specifications are subject to change without prior notice. Please confirm details with our sales team before ordering.