Outboard Flush Muff Single Feed Compact Rectangle Cups - 4Boats
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Flush Muff Single Feed Compact Rectangle Cups - 4Boats
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP
Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP

Outboard Motor Flush Muffs Single Feed Compact Rectangle Cups for Engines < 40HP

MD1053

  • Dispatched in 2-3 days
  • 30 Day Return Policy
  • In stock, ready to ship
  • Backordered, shipping soon
Our stock levels are dynamic and can change frequently. If a product appears to be in stock, it may have already sold out. Please contact us if you have any questions about availability. Thank you for your understanding.
Β£16.99
/
Tax included.

Outboard Flush Muff - MMS-426

Compact Rectangular Cups | Single Feed Design

Maintain your marine engine's peak performance with the MMS-426 Outboard Flush Muff. Designed specifically for smaller outboards and stern drives, this flusher allows you to quickly rinse away salt, sand, silt, and alkali after every trip. Regular use prevents cooling system clogging and internal corrosion, significantly extending the lifespan of your engine.

ENGINE PROTECTION: Effectively flushes the cooling system to prevent overheating and premature engine failure caused by salt buildup.

Key Features

  • βœ” Compact Rectangular Cups: Provides a superior seal on smaller gearboxes.
  • βœ” Hozelock Compatible: Quick-connect male fitting for standard garden hoses.
  • βœ” Spring-Steel Frame: Durable, high-tension frame ensures a tight, secure fit.
  • βœ” Marine-Grade Rubber: Flexible cups resist UV and saltwater degradation.

Technical Specs

SKU: MMS-426
Feed Type: Single Feed
Recommended HP: Below 40 HP
Connector: Universal (Standard Hose)
Material: Reinforced Rubber / Steel

Compatibility / Fitment Guide

Engine Type Application Range Notes
Small Outboards 2HP to 40HP Ideal for compact lower units.
Universal Brands Yamaha, Mercury, Suzuki, Tohatsu Fits side water intake grills.
Sterndrives Small I/O Engines Verify rectangular intake area fits cups.

OEM Cross Reference

Reference Number MD1053
Alternative Reference Sierra 099077-00 / Moeller 099077-00

Questions & Answers

Is this a genuine original part?

This is a premium quality aftermarket replacement part, manufactured to meet or exceed original equipment (OE) standards for fitment and performance.

How do I know if it is compatible?

We recommend checking the SKU/MPN and Cross Reference list provided above. If your original intake is rectangular and under 40HP, this is the correct fit.

Can I use this for engines larger than 40HP?

While it can physically fit some larger intakes, we recommend single-feed muffs for engines under 40HP. For larger engines, please see our dual-feed models at 4boats.co.uk to ensure adequate water volume.

Note: Please verify your water intake dimensions against the rectangular cup size before purchasing. Always monitor engine temperature during flushing.

For the products under Β£150 the shipping is Β£6.99.

Free delivery for most items over Β£150.

This site is protected by hCaptcha and the hCaptcha Privacy Policy and Terms of Service apply.

You may also like

Recently viewed

Why choose us

Untitled_1080_x_1080_px_1 - 4Boats

ITS ALL ABOUT THE QUALITY

We source the best products from the Top suppliers only. We’ve taken years of feedback and have doubled down on providing the best service.

Untitled_1080_x_1080_px_2 - 4Boats

TEAMWORK MAKES THE DREAMWORK

Our Suppliers and Partners are joining us in our commitment to challenge the way this industry operates. From product sourcing to fulfilling, they’re the best in the business.

Simple_Image_Play_Built_into_Routine_Cosmetics_TikTok_In-Feed_Ad_1080_x_1080_px_10 - 4Boats

YOU MATTER TO US.

All your orders are personally checked by a member of 4 BOATS and we make sure your orders are dispatched quickly so it arrives to your doorstep ASAP