T-H Marine Flow-Max Ball Scupper, Clear, 3 Inch Diameter x 2-1/2 Inch, Fits 1-1/4 Inch Motorwell Tubes

The T-H Marine Flow-Max Ball Scupper (FMS-1-0) is a positive-sealing replacement scupper designed for boaters ready to retire an old, worn-out flapper-style drain. Instead of a hinged flapper that wears down and leaks over time, the Flow-Max design uses a neutral-buoyancy ball that seats securely in the scupper body, preventing the ball from floating up and breaking the seal. The larger exit hole moves up to 70% more water than competing flapper scuppers, which means faster self-bailing and a drier cockpit or deck.

Installation is built around convenience: the housing includes multiple mounting holes so it can retrofit common existing hole patterns without filling old holes or re-drilling new ones. The seal is slotted to fit over 1-1/4 inch motorwell tubes. A stainless steel security pin is provided for added safety, and the unit ships with one #4 x 1/4 inch Phillips pan head stainless steel screw; the additional screws used to fasten the scupper to the hull are not included, since the correct screw length depends on each boat's hull thickness, so a tapered-head screw sized to your hull is required. For maintenance, the ball cavity twists off counterclockwise for quick access, allowing debris to be cleared out in seconds before twisting the unit back into place. The Flow-Max Ball Scupper is molded in clear plastic and meets ABYC standards.

Specifications

• Brand: T-H Marine
• Manufacturer Part Number: FMS-1-0
• Product Name: Flow-Max Ball Scupper - Clear
• Color: Clear
• Material: Plastic
• Dimensions: 3 inch diameter x 2-1/2 inch height
• Motorwell Tube Fit: 1-1/4 inch
• Valve Type: Ball Valve
• Drainage Performance: Up to 70% more drainage than competitive flapper-style scuppers
• Mounting Hardware Included: One #4 x 1/4 inch Phillips Pan Head Stainless Steel Screw and one stainless steel security pin
• Standards Compliance: Meets ABYC standards
• Weight: 1 pound
• UPC: 733572042610
• Package Dimensions: 3 x 4.75 x 8.75 inches

Frequently Asked Questions

What size motorwell tube does the FMS-1-0 Flow-Max Ball Scupper fit? The seal on the T-H Marine Flow-Max Ball Scupper is slotted to fit over 1-1/4 inch motorwell tubes.

Does the Flow-Max Ball Scupper come with all the mounting screws I need? Only one #4 x 1/4 inch Phillips pan head stainless steel screw is included with the FMS-1-0 scupper. The screws that fasten the unit to the hull are not included because the correct length depends on each boat's hull thickness, so you will need to supply your own tapered-head screws.

What color is the FMS-1-0 scupper? The Flow-Max Ball Scupper, part number FMS-1-0, is molded in clear plastic.

How much more water does the Flow-Max Ball Scupper drain compared to a flapper scupper? Up to 70% more water drains through the Flow-Max Ball Scupper's larger exit hole compared to competitive flapper-style scuppers.

Can the Flow-Max Ball Scupper be cleaned out if debris gets in it? Yes, twist the ball cavity counterclockwise to remove it, clean out the debris, and twist it back on; the FMS-1-0 was designed with this twist-off feature specifically to make cleaning quick.

Does the FMS-1-0 Flow-Max Ball Scupper meet ABYC standards? Yes, the T-H Marine Flow-Max Ball Scupper meets all ABYC standards.

What are the dimensions of the Flow-Max Ball Scupper? The FMS-1-0 measures 3 inches in diameter by 2-1/2 inches in height.

What material is the FMS-1-0 scupper made from? The Flow-Max Ball Scupper is made from plastic.

How much does the Flow-Max Ball Scupper weigh? The T-H Marine FMS-1-0 weighs 1 pound.

Will the Flow-Max Ball Scupper fit my existing scupper mounting holes? Multiple mounting holes are built into the FMS-1-0 housing, allowing it to retrofit common existing hole patterns without filling old holes or drilling new ones.

Why doesn't the ball inside the scupper float up and let water back in? The ball inside the Flow-Max Ball Scupper has neutral buoyancy, which keeps it seated properly so it will not float up and break the seal.

Is a security pin included with the FMS-1-0? Yes, a stainless steel security pin is provided with the Flow-Max Ball Scupper for added safety.