T-H Marine ILS-1200 Double Barb Inline Scupper Check Valve, 1-1/8 Inch Hose, Black

The T-H Marine ILS-1200 is a double barb inline scupper check valve built to fit 1-1/8 inch marine hose. It installs directly into the drain line to provide check valve protection at any point along the run, letting you use standard thru-hull fittings in the cockpit and on the hull exterior rather than requiring a dedicated flapper-style thru-hull. The core function is to prevent backwash: water and spray that would otherwise push back up through the scupper drain is stopped by an internal thermo-plastic flapper, while normal drainage flow out of the boat continues unrestricted.

The body is built from chemical resistant materials, making it suitable for continued exposure to bilge water, saltwater spray, and onboard cleaning chemicals without breaking down. The double barb design gives a secure hose connection on both the inlet and outlet sides, so the valve can be clamped inline into an existing scupper drain hose run rather than mounted at the hull. It is finished in black to blend with standard marine hose and fittings.

This 1-1/8 inch hose version is part of a size family that also includes 3/4 inch and 1-1/2 inch hose versions, each sold under its own part number, so it is important to confirm hose inside diameter before ordering.

Specifications

• Brand: T-H Marine
• Manufacturer Part Number: ILS-1200
• Product Type: Inline Scupper Check Valve (Double Barb)
• Hose Size: 1-1/8 inch
• Color: Black
• Material: Chemical resistant body with thermo-plastic flapper
• Outside Diameter: 1.13 inches
• Package Dimensions: 8.82 inches L x 5.2 inches W x 4.41 inches H
• Weight: 0.3 pounds
• UPC: 733572065008
• Standard Pack: 50 per box

Frequently Asked Questions

What size hose does the T-H Marine ILS-1200 fit? The ILS-1200 is built for 1-1/8 inch marine hose; T-H Marine also makes a 3/4 inch version and a 1-1/2 inch version under different part numbers, so hose inside diameter should be confirmed before ordering.

What does this scupper check valve actually do? It prevents backwash by blocking water from pushing back up through the scupper drain line while still allowing normal drainage to flow out, using an internal thermo-plastic flapper inside the ILS-1200 body.

Can I use this instead of a flapper-style thru-hull fitting? Yes, the ILS-1200 is designed to let you use standard thru-hull fittings in the cockpit and on the hull exterior instead of a dedicated flapper thru-hull, since the check valve function is built into the inline fitting itself.

What is the ILS-1200 made from? The body uses chemical resistant materials and the internal flapper is thermo-plastic, materials chosen to hold up to bilge water, saltwater, and onboard cleaning chemicals.

What color is this valve? The ILS-1200 double barb inline scupper check valve is black.

How much does the ILS-1200 weigh? The T-H Marine ILS-1200 weighs 0.3 pounds.

What are the outer dimensions of this fitting? The ILS-1200 has an outside diameter of 1.13 inches, and ships in packaging measuring 8.82 inches by 5.2 inches by 4.41 inches.

Does the ILS-1200 have barbs on both ends? Yes, it is a double barb design, meaning both the inlet and outlet sides have hose barbs so it can be clamped inline into an existing drain hose run.

How is the ILS-1200 installed? It installs inline in the scupper drain hose, with the hose slid over the barb on each end and secured with hose clamps at the connection points.

Is there a smaller or larger version of this check valve? Yes, T-H Marine offers this same double barb inline scupper check valve for 3/4 inch hose and for 1-1/2 inch hose, each under a different part number than the ILS-1200.

What is the UPC for the T-H Marine ILS-1200? The UPC for the T-H Marine ILS-1200 inline scupper check valve is 733572065008.