Quicksilver 42724A3 Water Pocket Cover Assembly for MerCruiser Sterndrive

The Quicksilver 42724A3 Water Pocket Cover Assembly is a genuine OEM Mercury Marine replacement part designed for the upper unit water pump on MerCruiser sterndrive systems. This cover assembly seals and protects the water pocket housing in the upper drive unit, ensuring proper coolant flow routing from the water pump through the sterndrive.

This assembly is a direct factory-replacement component and is the correct solution when servicing or rebuilding the upper unit cooling system on MerCruiser R, MR, and Alpha One Generation I sterndrives.

What's Included:

• Water pocket cover with gasket
• Water pocket mounting screws
• Water tube
• Water tube rubber seal

Key Features:

• Genuine OEM Part — Manufactured by Mercury Marine / Quicksilver to factory specifications
• Direct-Fit Replacement — Engineered to match original equipment tolerances for a proper seal
• Marine-Grade Construction — Designed for continuous exposure to both freshwater and saltwater environments
• Complete Assembly — Includes cover, gasket, water tube, screws, and seal for a full service repair

Cross-Reference Part Numbers:

• Mercury / Quicksilver OEM: 42724A3
• Supersedes / Related: 32489, 32489A2, 54235A2
• Sierra: 18-3219
• Mallory: 9-78139

This is a genuine Quicksilver factory OEM part backed by Mercury Marine's standard 1-year warranty against defects in materials and workmanship.