Drain Hose Assembly – Fits MerCruiser 4.3L, 5.0L, 5.7L Stern Drives (Replaces 32-87108, 32-861590A05)

Drain Hose Assembly – Fits MerCruiser 4.3L, 5.0L, 5.7L Stern Drives (Replaces 32-87108, 32-861590A05)

This drain hose assembly fits MerCruiser 4.3L, 5.0L, and 5.7L stern drive engines. It is used in the cooling system, connecting the circulation pump to the thermostat housing.

This part is a direct replacement for MerCruiser part numbers 32-87108, 32-861590A05, 32-861590A2, 32-806825, 32-861590A1, 33189, and 32-33189A1. It also replaces OMC/Johnson/Evinrude numbers 0312781, 0509280, 0910205, and Sierra 18-71337.

• Application: Manual Drain Cooling System
• Installation: Connects circulation pump to thermostat housing
• Included: 1 x Drain Hose Assembly

Part Number Cross-Reference

Use this table to confirm equivalent part numbers across OEM and aftermarket brands.

Compatible Engine Models

Confirm your engine model/year in the table below. For Mercury owners, here’s a guide to help you identify your engine’s serial/model: Mercury Serial Number Guide. You can also review exploded diagrams to verify part numbers: Mercury Parts Diagrams & Catalog.

Technical Specifications

Package Contents

1 x Drain Hose Assembly (32-87108/32-861590A05)

Installation Guide

1. Ensure the engine is off and has cooled down completely.
2. Locate the drain hose connecting the circulation pump and thermostat housing.
3. Place a drain pan below the hose to collect any residual coolant.
4. Loosen the clamps at both ends of the old hose and carefully detach it.
5. Clean the hose connection surfaces on the pump and housing.
6. Position the new drain hose and securely tighten the clamps on both ends.
7. Refill the cooling system according to the manufacturer’s specifications.
8. Start the engine and carefully inspect for leaks around the new hose and connections.

Troubleshooting & FAQ

Q: How do I confirm this hose fits my MerCruiser engine?

A: This hose assembly is designed for MerCruiser 4.3L, 5.0L, and 5.7L stern drive engines that use a manual drain cooling system. To ensure a correct fit, please cross-reference your original part number with the numbers in the "Part Number Cross-Reference" table and verify your engine model is listed in the "Compatible Engine Models" section.

Q: What are the signs that my drain hose needs to be replaced?

A: Common signs of a failing hose include visible cracks, brittleness, swelling, or active coolant leaks from the hose body or its connection points. We recommend regular visual inspections as part of your routine maintenance.

Q: What is the difference between this hose and the original OEM part?

A: This is an aftermarket part designed to meet or exceed original equipment manufacturer (OEM) specifications. It is constructed from comparable, high-grade materials and produced in an ISO9002-certified facility to ensure reliable performance and an accurate fit.

Q: OEM vs. Aftermarket?

A: This listing is an aftermarket replacement part (not an OEM component). We build to OEM specifications using comparable-grade materials. Production is done in an ISO9002-certified facility, and each batch is inspected for consistent performance.

Q: How fast do you ship and how much does it cost?

A: We offer fast global shipping—typically 5–15 days worldwide—and standard shipping is free. Expedited options are available at checkout depending on your location.

Q: What is your warranty and return policy?

A: This product includes a 1-year warranty against manufacturing defects under normal use. If something goes wrong, contact our support team with your order details. Returns are accepted within our standard return window (unused & in original condition); please see our policy page or reach out for instructions.

Important Notes

• Verify that the product images and specifications match your original part. If discrepancies exist—even if your model is listed—do not proceed with the purchase.
• This product is an aftermarket replacement part and is not an OEM component.
• Professional installation is recommended to ensure safety and optimal performance.

Why Choose JLM MARINE?

• Quality Assured: As a trusted manufacturer for over 20 years, we supply top marine brands globally.
• Fast Global Shipping: Free delivery worldwide in 5–15 days.
• Direct from Manufacturer: Competitive pricing without compromising quality.