Flow-Max™ Ball Scupper

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  • Replaces worn out flapper scuppers
  • 70% more drainage than competitive models
  • Twist off for easy cleaning
  • Retrofits all hole patterns
  • Seal is slotted to fit over 1-1/4" motorwell tubes

Tired of scupper leakage? Replace your old worn-out flapper scupper with our new Flow-Max™ positive sealing ball scupper. Larger exit hole allows 70% more water drainage than its nearest competitor. Multiple mounting holes make retrofits quick and easy - no filling holes or re-drilling. Neutral buoyancy ball ensures ball won't float up and break seal. Meets all ABYC standards.

New easy twist-off design makes cleaning debris a snap. Simply twist counterclockwise to remove ball cavity, clean out and twist back on. Stainless steel security pin provided for added safety.

The Flow Max Scupper comes with one screw. Mounting screws not included. Required mounting hardware will be different for every boat depending on the hull thickness; you will need a tapered head screw. Screw included is a #4 x 1/4" Phillips Pan Head Stainless Steel Screw.

OEM/Bulk Product Name Distributor Packaged
FMS-1-0 FLOW-MAX™ Ball Scupper - Clear 3" dia. x 2-1/2" h FMS-1-0-DP

OEM - Bulk: 50/Box

Distributor Packaged: 12/Box


  • Note: Must be installed above waterline
  • Compatibility: 1 1/4" motorwell tubes
  • Included Hardware: #4 x 1/4" Phillips Pan Head Stainless Steel Screw
  • Color: Clear/Transparent

Customer Reviews

Based on 11 reviews
Todd B.
On time and awesome.

My boat is a 2002 Scout...I replaced the old ones and they are exactly the same size and holes lined up.


Purchased 2 to replace on pursuit 1850. No information provided on screw specs. Screws from original ball scupper restrict locking scupper in place. Seeking screw specs.

rio a.
Prettier than it looks

bought 4 and will be installed after repowering. Tested manually and the ball track and seal the hole perfectly! Scupper Looks pretty still a virgin, however, but it will get a workout after it hits the ocean in a few weeks! corvib19 shutdown the SF shop so who knows when everything will be normal again! or get my boat back in the ocean! will update later

love the TH scupper highly recommended.

Jorge H.
Great Product!

Very satisfied. Easy to install, perfect fit. Tried function of ball scuppers in water... no mor water flowing into the transom when launching or anchored... great product!!!

L. B.
I nneded one and it came.

One was missing from my boat and the order came promptly.My only issue is there was a bug in the web sire which showed a sale price which would not carry over to the checkout page.

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