Pentair Sta-Rite MasterTemp/Max-E-Therm Manifold Bypass Valve Kit (77707-0001) bathpumps Replacing the cartridge can help

Replacing the cartridge can help restore more dependable filtration and improve water clarity

The Darlly 60403 is especially useful for service work where a 45 square foot cartridge with a narrower top opening and SAE lower fitment is needed to avoid guesswork and improve replacement accuracy

Confirm heater series and part number before ordering

The dark grey Emerald Cut style adds a more refined visual element than a plain functional insert alone

This tank lid is used with compatible PacFab FNS Plus 36 square foot DE filter systems where the upper housing requires replacement

Pentair Sta-Rite MasterTemp/Max-E-Therm Manifold Bypass Valve Kit (77707-0001) bathpumps Replacing the cartridge can helpThe manifold bypass valve kit supports controlled water movement inside compatible MasterTemp and Max E Therm heater manifolds. A worn or damaged bypass can affect heater flow behavior, temperature regulation, and internal water routing. Replacing the kit is often part of resolving heater performance issues related to flow, noise, or manifold service findings. This is a critical water path component and should be installed as part of a careful heater