Volvo Penta Seawater / Engine Flush T-Pipe 3862699 – 1" Hose
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Volvo Penta 3862699 – Seawater / Engine Flush T-Pipe
- Part Number: 3862699
- Brand: Volvo Penta (OEM Genuine)
- Official Product Type: T-Pipe – Seawater Cooling / Engine Flush Circuit
- Supersedes: 3848553 (earlier description: Fitting; current: T-Pipe)
- System: Seawater Cooling & Engine Flush
- Hose Size: 1-inch (25 mm) connections
- Weight: Approx. 0.05 lb (22 g)
- Kit Contents: T-pipe fitting only – hoses and clamps are serviced separately
The 3862699 is a genuine OEM Volvo Penta T-pipe used in the seawater-pump hose circuit on selected gasoline marine engines. It provides the branch connection point for the engine flushing system, routing cooling water through the seawater circuit while allowing a dedicated flush line to be connected. Volvo Penta parts diagrams place it directly in the seawater pump and hose assembly on confirmed applications.
Compatible Applications
- Volvo Penta 3.0L GL-series – seawater cooling circuit
- Volvo Penta 4.3GXi-C / 4.3GXi-CF – seawater pump hose assembly
- Volvo Penta 5.0GXi-E – seawater pump hose assembly
- Other Volvo Penta gasoline engines using 1-inch seawater / flush-hose plumbing (confirm by diagram)
Fitment Notice: Volvo Penta used different T-pipes depending on hose diameter. The 3862699 is associated with 1-inch hose plumbing. If your engine uses 1-1/4-inch plumbing, see the Volvo Penta T-Nipple 3589415 instead. Always confirm by engine serial number and the correct cooling-system parts diagram before ordering.
When to Replace
Replace the T-pipe when it is cracked, brittle, distorted, leaking at any hose connection, or damaged during seawater cooling or engine flush hose service. Plastic cooling fittings degrade over time from heat cycling and raw-water exposure — inspect them whenever adjacent hoses are replaced.
Service Interval
Inspect annually or whenever seawater cooling hoses and clamps are serviced. Replace proactively if the fitting shows any signs of brittleness, staining, or deformation. Cooling-circuit fittings are inexpensive to replace and costly to ignore.
Associated Service Parts
- Volvo Penta Hose Clamp 1399 – OEM marine hose clamp used adjacent to this fitting (diagram reference: 982645)
- Volvo Penta Hose 3862901 – Related seawater cooling hose
- Volvo Penta T-Nipple 3589415 – Alternate T-fitting for 1-1/4" hose configurations
Installation Notes
Inspect all adjoining hoses and clamps whenever the T-pipe is replaced. Ensure hose ends seat fully over the T-pipe barbs before tightening clamps. Volvo Penta diagrams show 982645 hose clamps adjacent to this fitting — replace clamps if they show corrosion or reduced clamping force. Confirm hose routing matches the factory cooling-system diagram for your engine model.
Technical FAQ
Q: What is the difference between the 3862699 and 3589415?
A: The 3862699 is designed for 1-inch hose plumbing in the seawater / flush circuit. The 3589415 is used in certain 1-1/4-inch configurations. Using the wrong size will result in poor hose fit and potential leakage.
Q: Can I use a generic hardware-store T-fitting?
A: Not recommended. The barb dimensions and material of the OEM fitting are matched to Volvo Penta hose tolerances and raw-water cooling conditions. A generic fitting may not seat properly, leading to leaks or incorrect flush routing.
Q: Does this part come with hoses or clamps?
A: No. This listing is for the T-pipe fitting only. Hoses and clamps are serviced separately — see associated service parts above.
Parts Desk Insights
Best Use Case: This is the correct part for customers replacing a cracked or leaking T-fitting in the seawater pump hose circuit on 4.3GXi, 5.0GXi, and 3.0L GL gasoline engines. It is most often ordered alongside replacement hoses and clamps during a full cooling-system hose service.
Common Issues: The most frequent mistake is ordering by engine displacement alone without checking hose diameter — the 1-inch and 1-1/4-inch T-fittings are not interchangeable. Customers also sometimes overlook replacing adjacent hose clamps during T-pipe service, which can cause leaks even after the new fitting is installed.
Shipping information
In-stock and OEM parts: ship same or next business day.
Locally warehoused items: ship within 1-3 business days.
Special-order items: timeline confirmed after order.
Returns & warranty
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If you are not fully satisfied, you may request a return within 30 days of delivery. All returns must receive pre-approval prior to being sent back. Unauthorized returns will not be accepted.
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