Perko Thru-Hull Scupper, Transom Mount, 1-1/2 in Hose, 2-1/8 in Max Hull Thickness

Overview

The Perko Thru-Hull Scupper for Mounting through Transom is a transom-mounted scupper valve for draining cockpit, deck, or splashwell water through the hull side of a boat. It fits 1-1/2" hose and uses a 1-7/8" mounting hole, with a 2-7/8" outside flange and support for hull thicknesses up to 2-1/8".

The body is molded white polymer and uses a soft black flapper to help reduce backflow while still allowing water to drain out. This makes it a practical fit for above-waterline scupper drains where water needs a simple exit path through the transom.

This fitting is intended for hose-connected thru-hull scupper use and should not be installed below the waterline. Before installation, confirm the hose size, transom thickness, hole diameter, and mounting location on the boat.

Key features

• Fits 1-1/2" hose for common cockpit, deck, and splashwell drain plumbing.
• Mounts through the transom with a 1-7/8" hole and a 2-7/8" outside flange.
• Works with hull thicknesses up to 2-1/8", which helps confirm fit before cutting or replacing an existing scupper.
• Molded white polymer body suits visible transom installations where a clean white finish is preferred.
• Soft black flapper helps limit water backing into the drain opening.
• Available as the valve only or as the valve with a stainless steel cover for a different exterior finish.

Variants

This scupper is offered in two configurations. Both variants are based on the same transom-mounted scupper application, with the visible cover configuration being the main difference.

The valve-only version keeps the installation simple with the molded polymer exterior, while the stainless steel cover version adds a metal cover at the outside face of the fitting.

• 0323DP: Type Valve Only. This version is suited to straightforward replacement or installation where the molded white polymer exterior matches the boat and no stainless cover is needed.
• 0323DP0STS: Type Valve & Stainless Steel Cover. This version keeps the same scupper function and adds a stainless steel cover for a different transom appearance.

Installation and fit

Check the transom area from both sides before cutting or replacing the fitting. The hose connection, flapper clearance, mounting hole, and nut access all need enough room for a clean installation and later inspection.

Because this is a drain fitting, the mounting location should allow water to leave the deck or cockpit naturally without trapping standing water around the scupper. Bedding and fastening should be handled in a way that suits the hull material and the boatbuilder’s service practice.

Use cases on board

This scupper is a good match for boats that need a simple transom drain for cockpit, deck, or splashwell water above the waterline. It is especially useful when the buyer needs to match a 1-1/2" hose and a compact flange footprint without moving to a more complex drain assembly.

What’s included

• Thru-hull scupper valve
• Nut
• Mounting hardware

Shipping
We ship worldwide from the United States. Rates are calculated at checkout based on destination and package weight. Some items include free shipping, which will show automatically. Not every product is eligible for international shipping; checkout will confirm eligibility. We do not ship to PO Boxes except through USPS, and not all packages qualify.

Processing and dispatch
Most orders are verified, packed, and handed to the carrier within 1 to 2 business days. Some products may need extra handling time or ship directly from the manufacturer. For certain international orders, inventory transfers between warehouses may add time. If any delay is expected, we will let you know the dispatch date.

Delivery and tracking
Deliveries are handled by trusted carriers such as USPS, UPS, FedEx, and DHL. Estimated arrival times appear at checkout and depend on your location and the service you choose. These are estimates and can be affected by customs or carrier disruptions. A shipping confirmation with a tracking link is emailed when your order ships, and tracking may take up to 24 hours to update. You can also view tracking in your account.

Duties, taxes, and support
International customers are responsible for any customs duties, taxes, and fees charged by the destination country. If these charges are refused and a shipment returns to us, the carrier’s return cost and any re-entry customs fees will be deducted from the refund. If your order is late or you need help, contact cs@qualityboatparts.com and we will assist you.

Quality Boat Parts is a reseller. Many items include a manufacturer’s warranty, and all warranty service is handled directly by the manufacturer. We do not manage or administer warranty claims on behalf of customers.

Warranty terms, coverage, and duration are set by each manufacturer. Issues involving defects, repairs, or replacements must be addressed with the manufacturer’s support team. When available, the warranty period is listed on the product page. If it is not shown, contact us or the manufacturer for details before purchasing.

To start a claim, the customer must contact the manufacturer and follow their process. Keep your proof of purchase and original packaging, and register the product if the manufacturer requires it, as these are often needed for warranty service.

We are happy to help you find the right contact or documentation, but we cannot decide outcomes or intervene in claim resolutions. For guidance, email cs@qualityboatparts.com.