Pentair Triton filter tank lid, 8-1/2" Black — buttress-thread direct-fit replacement

Replacement Pentair tank lid kit for Triton II/C-3/TR100C/TR140C filters — 8-1/2" black buttress-thread closure that restores a secure, leak-resistant seal.

When your Triton-series pool or spa filter lid becomes worn, cracked, or difficult to seal, this Pentair 154856 buttress thread closure kit provides a direct-fit replacement engineered for the Triton II, C-3, TR100C and TR140C housings. The kit reproduces the original lid dimensions and thread profile so you can reinstall a dependable cover quickly without replacing the entire filter tank. It’s designed for straightforward swap-outs and to match the factory fit and finish in both appearance and function.

How does this lid kit fit my Triton filter?

The Pentair kit is manufactured to the same specifications as the original Triton lid, including the 8-1/2" diameter and buttress thread pattern. That means it threads into the existing tank collar and aligns with the factory seal surface for a tight fit.

• Compatible models: Triton II, C-3, TR100C, TR140C.
• 8-1/2" diameter matches original factory lid sizing.
• Buttress-style threading for secure mechanical engagement.
• Direct replacement—no tank modification required.

What materials and finish should I expect?

The lid is molded in durable black thermoplastic engineered for pool and spa environments, providing resistance to chlorine and UV exposure typical of outdoor installations. Its finish matches common Pentair aesthetic standards and is built for repeated installation and removal.

• Black thermoplastic construction for chemical and UV resistance.
• Precision molded thread profile for long-term engagement.
• Smooth sealing surface to mate with existing O-rings or gaskets.
• Factory color and texture to blend with the filter tank.

How easy is installation and what tools are needed?

Installing the replacement closure is a simple maintenance task that most pool owners or service techs can complete in minutes. You’ll typically remove the old lid, inspect or replace the O-ring, then thread in the new closure hand-tight plus a small final turn with a strap wrench if needed.

• Minimal tools: strap wrench or large pliers with padding recommended.
• Inspect and lubricate O-ring or replace if brittle before installation.
• Hand-thread first to avoid cross-threading, then snug to seal.
• Follow standard safety: depressurize system prior to removal/installation.

Will this lid prevent leaks and restore performance?

Replacing a degraded lid with this genuine Pentair closure restores the original mechanical seal interface, reducing the chance of leaks caused by cracked or stripped closures. Proper installation with a good O-ring improves pressure retention and filter performance comparable to factory condition.

• Replaces worn or cracked lid that can cause bypass or leaks.
• Restores correct sealing distance and thread engagement.
• Works with existing tank gasket or newly replaced O-ring for best results.
• Helps maintain intended filter pressure and flow characteristics.

Who is this for: This Pentair 154856 8-1/2" black buttress-thread tank lid kit is intended for pool and spa owners, maintenance professionals, and service centers that operate Triton II, C-3, TR100C or TR140C filters. Choose this part when you need a direct, OEM-compatible replacement to stop leaks, restore correct sealing geometry, and avoid the cost of a full tank replacement. If you’re unsure about model compatibility, check your filter model plate or consult Pentair documentation before ordering.