jlm marine water drain distribution housing black plastic with three main hose ports two smaller side ports downward port and two mounting tabs
photo jlm marine water drain distribution housing assembly for mercruiser 4.3l 5.0l 5.7l 6.2l and 350 377 383 mpi 21dh002 black plastic with orange bypass connector and blue caps
photo of JLM Marine water drain housing assembly with blue plugs and orange hose for Mercury Mercruiser 4.3L to 6.2L and 350 to 383 MPI 21DH002, black plastic, various inlets and outlets, mounting flanges with brass grommets
photo of JLM Marine water drain distribution housing assembly 21dh002, black spherical plastic with top and side spigots, and orange inlet tube
photo of JLM Marine water drain distribution housing assembly for Mercury Mercruiser 4.3 5.0 5.7 6.2L and 350 377 383 MPI, black plastic with orange hose, multiple spouts, mounting tabs
photo of jlm marine water drain distribution housing assembly 21dh002 for mercury mercruiser 4.3l 5.0l 5.7l 6.2l and 350 377 383 mpi, black with multiple outlets and blue ribbed caps
photo of jlm marine water drain distribution housing assembly 21dh002 with two blue threaded plugs and two black o-rings
photo of jlm marine black plastic water drain distribution housing assembly for mercruiser 4 3 5 0 5 7 6 2l and 350 377 383 mpi 21dh002 with orange hose attached and two blue plastic caps below
photo of jlm marine water drain distribution housing assembly for mercury mercruiser 4.3-6.2l and 350-383 mpi 21dh002, black plastic, bulbous body with horizontal left, vertical top, and orange elbow front right hose connections, multiple mounting tabs with brass inserts
jlm marine water drain distribution housing black plastic with three main hose ports two smaller side ports downward port and two mounting tabs
photo jlm marine water drain distribution housing assembly for mercruiser 4.3l 5.0l 5.7l 6.2l and 350 377 383 mpi 21dh002 black plastic with orange bypass connector and blue caps
photo of JLM Marine water drain housing assembly with blue plugs and orange hose for Mercury Mercruiser 4.3L to 6.2L and 350 to 383 MPI 21DH002, black plastic, various inlets and outlets, mounting flanges with brass grommets
photo of JLM Marine water drain distribution housing assembly 21dh002, black spherical plastic with top and side spigots, and orange inlet tube
photo of JLM Marine water drain distribution housing assembly for Mercury Mercruiser 4.3 5.0 5.7 6.2L and 350 377 383 MPI, black plastic with orange hose, multiple spouts, mounting tabs
photo of jlm marine water drain distribution housing assembly 21dh002 for mercury mercruiser 4.3l 5.0l 5.7l 6.2l and 350 377 383 mpi, black with multiple outlets and blue ribbed caps
photo of jlm marine water drain distribution housing assembly 21dh002 with two blue threaded plugs and two black o-rings
photo of jlm marine black plastic water drain distribution housing assembly for mercruiser 4 3 5 0 5 7 6 2l and 350 377 383 mpi 21dh002 with orange hose attached and two blue plastic caps below
photo of jlm marine water drain distribution housing assembly for mercury mercruiser 4.3-6.2l and 350-383 mpi 21dh002, black plastic, bulbous body with horizontal left, vertical top, and orange elbow front right hose connections, multiple mounting tabs with brass inserts

Water Drain Distribution Housing – Fits Mercury MerCruiser 4.3L 5.0L 5.7L 6.2L Engines (Replaces 863444T1, 863444A1, 863444T2)

Vendor: JLM Marine
Availability: In Stock
Product Type: Water Distribution Housing
$87.90
$119.00
$87.90
Subtotal: $87.90

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jlm marine water drain distribution housing black plastic with three main hose ports two smaller side ports downward port and two mounting tabs

Water Drain Distribution Housing – Fits Mercury MerCruiser 4.3L 5.0L 5.7L 6.2L Engines (Replaces 863444T1, 863444A1, 863444T2)

$119.00 $87.90
jlm marine water drain distribution housing black plastic with three main hose ports two smaller side ports downward port and two mounting tabs
photo jlm marine water drain distribution housing assembly for mercruiser 4.3l 5.0l 5.7l 6.2l and 350 377 383 mpi 21dh002 black plastic with orange bypass connector and blue caps
photo of JLM Marine water drain housing assembly with blue plugs and orange hose for Mercury Mercruiser 4.3L to 6.2L and 350 to 383 MPI 21DH002, black plastic, various inlets and outlets, mounting flanges with brass grommets
photo of JLM Marine water drain distribution housing assembly 21dh002, black spherical plastic with top and side spigots, and orange inlet tube
photo of JLM Marine water drain distribution housing assembly for Mercury Mercruiser 4.3 5.0 5.7 6.2L and 350 377 383 MPI, black plastic with orange hose, multiple spouts, mounting tabs
photo of jlm marine water drain distribution housing assembly 21dh002 for mercury mercruiser 4.3l 5.0l 5.7l 6.2l and 350 377 383 mpi, black with multiple outlets and blue ribbed caps
photo of jlm marine water drain distribution housing assembly 21dh002 with two blue threaded plugs and two black o-rings
photo of jlm marine black plastic water drain distribution housing assembly for mercruiser 4 3 5 0 5 7 6 2l and 350 377 383 mpi 21dh002 with orange hose attached and two blue plastic caps below
photo of jlm marine water drain distribution housing assembly for mercury mercruiser 4.3-6.2l and 350-383 mpi 21dh002, black plastic, bulbous body with horizontal left, vertical top, and orange elbow front right hose connections, multiple mounting tabs with brass inserts

Water Drain Distribution Housing – Fits Mercury MerCruiser 4.3L 5.0L 5.7L 6.2L Engines (Replaces 863444T1, 863444A1, 863444T2)

$119.00 $87.90
Description

Water Drain Distribution Housing – Fits Mercury MerCruiser 4.3L, 5.0L, 5.7L, & 6.2L Engines

This water drain distribution housing is a direct-fit replacement for a range of Mercury MerCruiser engines. It is designed for 262 CID (4.3L), 305 CID (5.0L), 350 CID (5.7L), and 377 CID (6.2L) V6 and V8 models from 1998 and newer, including 350, 377, and 383 MAG MPI variants.

This assembly directly replaces Mercury MerCruiser OEM part numbers: 863444T1, 863444A1, 863444T2, and 863631T1.

  • Engine compatibility: V6 & V8 marine engines (1998+)
  • Installation type: Direct replacement with manual drain plugs
  • Package includes: 1x Housing, 2x Drain Plugs, 2x O-Rings

Part Number Cross-Reference

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

Brand Part Number
Mercury MerCruiser 863444T1
Mercury MerCruiser 863444A1


Mercury MerCruiser 863444T2
Mercury MerCruiser 863631T1

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.

Brand Model Rated HP Stroke Years OEM Part No. Notes
Mercury MerCruiser 4.3L MPI ALPHA/BRAVO 4.3L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 4.3L MPI ALPHA/BRAVO EC 4.3L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 5.0L MPI ALPHA/BRAVO 5.0L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 5.0L MPI ALPHA/BRAVO EC 5.0L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 5.7L MPI MIE 5.7L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 5.7L MPI MIE EC 5.7L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 5.7L MPI SKI 5.7L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 5.7L MPI TOWSPORT WITH GEN III 5.7L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 5.7L SKI EC 5.7L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 350 MAG MPI ALPHA/BRAVO 350 4-Stroke 1998+ 863444T1
Mercury MerCruiser 350 MAG MPI ALPHA/BRAVO EC 350 4-Stroke 1998+ 863444T1
Mercury MerCruiser 350 MAG MPI HORIZON ALPHA/BRAVO 350 4-Stroke 1998+ 863444T1
Mercury MerCruiser 350 MAG MPI HORIZON ALPHA/BRAVO EC 350 4-Stroke 1998+ 863444T1
Mercury MerCruiser 350 MAG MPI HORIZON MIE 350 4-Stroke 1998+ 863444T1
Mercury MerCruiser 350 MAG MPI MIE 350 4-Stroke 1998+ 863444T1
Mercury MerCruiser 350 MAG MPI SKI 350 4-Stroke 1998+ 863444T1
Mercury MerCruiser 350 MPI ALPHA 350 4-Stroke 1998+ 863444T1
Mercury MerCruiser SCORPION 350 EC 350 4-Stroke 1998+ 863444T1
Mercury MerCruiser 377 MAG MPI BRAVO 377 4-Stroke 1998+ 863444T1
Mercury MerCruiser 377 MAG MPI BRAVO EC 377 4-Stroke 1998+ 863444T1
Mercury MerCruiser SCORPION 377 HO EC 377 4-Stroke 1998+ 863444T1
Mercury MerCruiser 383 MAG STROKER INBOARD 383 4-Stroke 1998+ 863444T1
Mercury MerCruiser 6.2L MPI MIE 6.2L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 6.2L MPI MIE EC 6.2L 4-Stroke 1998+ 863444T1
Mercury MerCruiser 6.2L MPI HORIZON MIE 6.2L 4-Stroke 1998+ 863444T1
Mercury MerCruiser MX 6.2L MPI BRAVO 6.2L 4-Stroke 1998+ 863444T1
Mercury MerCruiser MX 6.2L MPI HORIZON BRAVO 6.2L 4-Stroke 1998+ 863444T1
Mercury MerCruiser MX 6.2L MPI HORIZON MIE 6.2L 4-Stroke 1998+ 863444T1
Mercury MerCruiser MX 6.2L MPI MIE 6.2L 4-Stroke 1998+ 863444T1
Mercury MerCruiser MX 6.2L MPI SKI 6.2L 4-Stroke 1998+ 863444T1

Technical Specifications

Specification Value
Product Type Water Drain Distribution Housing Assembly
Installation Direct replacement
Housing Material Metal (Aluminum) and plastic components
Housing Color Silver/Gray (natural aluminum)
Fitting Type Manual drain plugs with screw-in installation
Other Technical Attributes Features manual drain functionality; standard cooling system compatible

Package Contents

  • 1 x Water Distribution Housing
  • 2 x Manual Drain Plugs
  • 2 x O-Rings

Installation Guide

  1. Safety First: Ensure the engine is off and cool. Disconnect the negative battery terminal.
  2. Drain Coolant: Place a catch pan under the engine and open the drain plugs to empty the cooling system.
  3. Remove Old Housing: Carefully disconnect any hoses attached to the housing and unbolt it from the engine block.
  4. Clean Surface: Thoroughly clean the mounting surface on the engine block, removing any old gasket material or sealant.
  5. Install New Housing: Place the new O-rings on the new distribution housing. Mount the housing and tighten the bolts to the manufacturer's recommended torque specifications.
  6. Reconnect & Refill: Re-attach any hoses and install the new drain plugs. Refill the cooling system with the appropriate coolant.
  7. Final Checks: Reconnect the battery terminal. Start the engine and let it run for several minutes, carefully checking for any leaks around the new housing.

Troubleshooting & FAQ

How do I confirm this fits my engine?
This housing fits MerCruiser V6 and V8 engines (4.3L, 5.0L, 5.7L, 6.2L) from 1998 and newer. To ensure a perfect match, please review the detailed "Compatible Engine Models" table and verify that your model is listed. Cross-referencing your original part number with the numbers on our list (e.g., 863444T1) is the best way to confirm fitment.

What are the signs that my water distribution housing is failing?
Common signs of failure include visible coolant leaks from the housing body or its seals, cracks in the material, persistent engine overheating issues, or difficulty using the drain plugs for winterization.

Is this housing a direct replacement for the original?
Yes, this is an aftermarket part engineered to be a direct-fit replacement. It matches OEM specifications for size, mounting points, and function to ensure a straightforward installation without modifications.

OEM vs. Aftermarket?
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.

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

What is your warranty and return policy?
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.
Shipping

We can ship to virtually any address in the world with free shipping available for most regions.

For our typical US and Canadian customers , our shipping timeframes are as follows:

  • Amazon FBA: orders will be delivered within 1-5 business days after placing the order (during certain special periods such as major promotions, Christmas, etc., the delivery time of Amazon FBA may be affected).
  • US warehouse shipment: orders will be delivered within 5 days after placing the order.
  • China warehouse shipment: orders will be delivered about 12 days after placing the order.

When you place an order, we will estimate shipping and delivery dates for you based on the availability of your items and the shipping options you choose. Depending on the shipping provider you choose, shipping date estimates may appear on the shipping quotes page.

Please also note that the shipping rates for many items we sell are weight-based. The weight of any such item can be found on its detail page. To reflect the policies of the shipping companies we use, all weights will be rounded up to the next full pound.

About JLM Marine

Founded in 2002, JLM Marine has established itself as a dedicated manufacturer of high-quality marine parts, based in China. Our commitment to excellence in manufacturing has earned us the trust of top marine brands globally.

As a direct supplier, we bypass intermediaries, which allows us to offer competitive prices without compromising on quality. This approach not only supports cost-efficiency but also ensures that our customers receive the best value directly from the source.

We are excited to expand our reach through retail channels, bringing our expertise and commitment to quality directly to boat owners and enthusiasts worldwide.

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