Neptune 003697 Feeder Cap Assembly | 4" Threaded 300 PSI

Neptune 003697 Universal Feeder Cap Assembly

The Neptune 003697 is the official replacement 4-inch threaded cap assembly designed for the entire line of Neptune bypass and filter feeders. Engineered for quick access and maximum safety, this high-pressure closure allows for tool-free operation while maintaining a robust seal in demanding industrial water treatment environments.

Precision Sealing and Safety The 003697 assembly utilizes a coarse-thread, 2.5-turn design that provides a superior seal with minimal physical force. For added safety, the cap is engineered to bind tightly under pressure, ensuring it cannot be accidentally removed until the tank has been properly bled. The underside of the cast-iron cap features a protective epoxy coating to resist corrosion from aggressive chemical additives.

Technical Specifications:

• Part Number: 003697

• Size: 4-inch diameter opening

• Material: Cast Iron with Epoxy-Coated underside

• Maximum Pressure: 300 PSI

• Included Components: Cap assembly and heavy-duty O-ring gasket

• Compatibility: Fits all Neptune VTF, DBF, and FTF series feeders

The Water Treatment Resource Advantage: Don't settle for aftermarket caps that may compromise your system's pressure rating. The genuine Neptune 003697 ensures your feeder maintains its full 300 PSI capability. We include the necessary 4-inch O-ring gasket with every assembly, allowing you to restore your equipment to factory specifications immediately upon delivery.