Sierra 18-4226 Drain Plug, Replaces Mercruiser 22-806608A1 and 22-806608A02

The Sierra 18-4226 Drain Plug is a direct replacement drain plug engineered for Mercruiser exhaust manifold drain applications. It is molded from durable black plastic designed to seal the manifold drain port securely, helping prevent freeze damage and corrosion-related leaks when the engine is winterized or drained for service. As a genuine Sierra part, it is built to meet or exceed the quality of the original equipment plug it replaces.

This drain plug is a straightforward, one-piece replacement part sold individually, making it an easy and affordable fix when an original Mercruiser drain plug is lost, cracked, or no longer seals properly. Because it is cross-referenced to the Mercruiser 22-806608A1 and 22-806608A02 numbers, boat owners and technicians can confirm fitment by matching the old part number before ordering. Sierra part 18-4226 is a reliable choice for routine engine maintenance, winterization, and exhaust manifold servicing.

Specifications

• Brand: Sierra
• Manufacturer Part Number: 18-4226
• Product Type: Drain Plug
• Material: Plastic
• Color: Black
• Weight: 1.27 pounds
• UPC: 808282125158
• Number of Items: 1
• OEM Cross Reference: 22-806608A1, 22-806608A02
• Application: Mercruiser Exhaust Manifold

Fitment

Designed for Mercruiser exhaust manifold applications using drain plug numbers 22-806608A1 or 22-806608A02.

Replaces (OEM)

• 22-806608A1
• 22-806608A02

Frequently Asked Questions

What OEM part numbers does the Sierra 18-4226 drain plug replace? The Sierra 18-4226 drain plug replaces Mercruiser part numbers 22-806608A1 and 22-806608A02.

What is the Sierra 18-4226 drain plug made of? It is made of black plastic, molded to seal the drain port of a Mercruiser exhaust manifold.

How much does the 18-4226 drain plug weigh? It weighs 1.27 pounds.

Is this a genuine Sierra part or an aftermarket copy? Sierra 18-4226 is a Sierra-brand replacement part built to meet or exceed the quality of the original Mercruiser drain plug it replaces.

What is this drain plug used for? It is used to seal the drain port on Mercruiser exhaust manifolds, commonly removed during winterization or engine maintenance to drain water from the manifold.

How many drain plugs come in a package? The Sierra 18-4226 is sold as a single drain plug, one count per package.

What color is the Sierra 18-4226 drain plug? It is black.

How do I know if 18-4226 is the correct drain plug for my engine? Check the part number stamped on your existing drain plug; if it reads 22-806608A1 or 22-806608A02, the Sierra 18-4226 is the correct replacement.

Does the Sierra 18-4226 include any other hardware in the box? No, it includes only the drain plug itself; no additional hardware is included.

What is the Sierra part number for this drain plug? The part number is 18-4226.