Description

The SIERRA Riser Block Off Gasket – is designed to provide a dependable seal when an exhaust riser is removed, blocked off, or temporarily taken out of service. It helps protect marine engines from water intrusion, exhaust leaks, debris entry, and corrosion during winterization, rebuilds, riser replacement, or service work.

Precision-cut for proper riser port sealing, this gasket is made from durable marine-grade compressed gasket material suitable for demanding exhaust environments.

Key Features

• Precision-cut riser block off gasket
• Helps prevent water ingestion into the engine
• Reduces risk of exhaust gas leaks
• Useful during winterization, rebuilds, and riser service
• Marine-grade compressed gasket construction
• Designed for inboard and sterndrive exhaust applications
• New replacement gasket

Specifications

• SKU: 47-04761
• Brand: SIERRA
• Type: Riser Block Off Gasket
• Material: Marine-grade compressed gasket material
• Condition: New
• Application: Marine exhaust riser block-off sealing

Compatibility & Fitment

Designed for compatible marine inboard and sterndrive exhaust riser applications using SIERRA 18-04761. Always verify fitment by comparing your existing gasket, riser port shape, engine model, and manufacturer part number before installation.

Installation Notes

Clean and inspect all mating surfaces before installation. Check for corrosion, warping, pitting, or old gasket residue. Install using manufacturer-recommended torque specifications. Replace the gasket each time the riser is removed to ensure a reliable seal.

Maintenance Tips

Inspect riser and manifold sealing surfaces during seasonal service. Replace worn, crushed, or heat-damaged gaskets immediately. Keep spare gaskets on hand for winterization and exhaust system maintenance.