The Pentair Bulkhead FNS 2 3/8-8 Butt is a genuine Pentair replacement bulkhead fitting designed for use with Pentair FNS series pool filters. This bulkhead serves as a critical structural and sealing component, providing a secure connection point between the filter tank and internal or external plumbing connections.

Bulkheads are responsible for maintaining a watertight seal where plumbing passes through the filter tank wall. Because this area is under constant pressure during system operation, even minor wear, cracking, or thread damage can result in leaks, pressure loss, or compromised filtration performance. A properly functioning bulkhead ensures stable operation and protects the integrity of the filter tank.

This replacement bulkhead is commonly installed during filter rebuilds, leak repairs, or when servicing older FNS filters showing signs of seepage or mechanical fatigue.

Why the Bulkhead Matters

The bulkhead is a critical pressure-sealing component in the filter system.

Why this matters:

• Maintains a watertight seal at the filter tank connection

• Prevents leaks caused by pressure and vibration

• Protects the structural integrity of the filter tank

• Ensures proper alignment of internal filter components

• Supports consistent filtration system performance

A compromised bulkhead can lead to persistent leaks and may place unnecessary stress on the filter housing and connected plumbing.

Designed for Pentair FNS Filter Systems

This bulkhead is manufactured to Pentair OEM specifications and is designed specifically for Pentair FNS series filters requiring a 2 3/8-8 butt-style bulkhead connection. Proper thread pitch, sealing surfaces, and material strength ensure correct fit and long-term durability under normal operating pressures.

Using an OEM Pentair bulkhead helps avoid issues associated with improper thread engagement or misalignment that can occur with non-matching or aftermarket fittings. Always confirm filter model compatibility before installation.

Service-Ready Replacement Component

Replacing a bulkhead is typically performed during major filter service, internal component replacement, or when leaks are detected at the tank wall connection. Installation should be done carefully to ensure correct gasket placement and proper torque without over-tightening.

During service, it is recommended to inspect associated O-rings, gaskets, and internal fittings to ensure a complete and reliable repair. Proper installation helps prevent repeat leaks and reduces the need for future disassembly.

Product Specifications

Buy with Confidence from Benchmark Pool Supply

When you purchase the Pentair Bulkhead FNS 2 3/8-8 Butt from Benchmark Pool Supply, you’re getting a genuine replacement part trusted by pool service professionals. We stock critical filter components to support reliable repairs and long-term system performance.

Benchmark Pool Supply is your trusted source for professional-grade pool filtration parts and equipment service components.