Dometic 385310076 1-1/2 Inch Duckbill Valve Kit for S and T Series Pumps, 2-Pack, Replaces Sealand 358310689

The Dometic 385310076 Duckbill Valve Kit is designed for Dometic S and T series vacuum pumps, providing the one-way check valve seal that keeps the vacuum flush system operating correctly. Each kit includes two 1-1/2 inch duckbill valves, sized to match the pump housings used in these Dometic vacuum generator and pump assemblies. Duckbill valves work by allowing waste and flush water to pass through in one direction while sealing against backflow, which is essential for the pump to build and hold vacuum. Because these valves are made of flexible material that flexes with every pump cycle, Dometic recommends replacing them every three years as routine maintenance, even before they show visible signs of wear, to prevent a loss of vacuum or reduced flush performance. The kit is a direct fit replacement for the duckbill valves originally installed in S and T series pumps and is also cross-referenced to older Sealand-branded part numbers, making it easy to order the correct replacement regardless of which part number appears on the original equipment. This is a maintenance part intended for boat owners and marine service technicians servicing Dometic Vacuflush and Traveler system pumps.

Specifications

• Brand: Dometic
• Manufacturer Part Number: 385310076
• Product Type: Duckbill Valve Kit
• Diameter: 1-1/2 inches
• Pack Quantity: 2 valves per kit
• Material: Plastic
• Compatible Pump Series: Dometic S and T series pumps
• Recommended Replacement Interval: Every 3 years
• Weight: 0.01 pounds
• UPC: 087735102520

Fitment

Fits Dometic S and T series vacuum pumps used in Vacuflush and Traveler toilet systems. Consult the parts book for your specific model toilet to confirm compatibility before ordering.

Replaces (OEM)

• Sealand 358310689
• Sealand 600347802

Frequently Asked Questions

What does the Dometic 385310076 duckbill valve kit fit? The Dometic 385310076 kit is designed for Dometic S and T series vacuum pumps used in Vacuflush and Traveler toilet systems. It is recommended to check your parts book for your specific model toilet to confirm the correct fit before ordering.

How many valves come in this kit? This kit includes 2 duckbill valves, each 1-1/2 inches in diameter, sized for one pump.

How often should the duckbill valves be replaced? Dometic recommends replacing the duckbill valves in the S and T series pump every three years as part of routine maintenance, since the valves flex with every pump cycle and can wear out even without an obvious leak.

Is the 385310076 kit the same part as the Sealand 358310689 or 600347802? Yes, part number 385310076 directly replaces the older Sealand-branded numbers 358310689 and 600347802, so any of those numbers can be used to identify the correct valve for your pump.

What material are the duckbill valves made from? The valves in the Dometic 385310076 kit are made of plastic, formulated to flex repeatedly during pump operation while maintaining a vacuum seal.

What size are the duckbill valves in this kit? Each duckbill valve in the 385310076 kit measures 1-1/2 inches in diameter.

Why is my vacuum pump losing suction? A common cause of reduced vacuum in Dometic S and T series pumps is worn duckbill valves, which is why Dometic recommends replacing them with a kit like the 385310076 every three years.

Is this a genuine Dometic part? Yes, the 385310076 duckbill valve kit is a genuine Dometic part manufactured for S and T series vacuum pumps.

Does this kit include installation hardware? The 385310076 kit includes the two duckbill valves only; no additional hardware is specified as included with this kit.

Can I use this kit on any Dometic toilet? The 385310076 duckbill valve kit is intended for S and T series pumps specifically, so it is recommended to consult the parts book for your specific model toilet to confirm this is the correct valve before installing.