Pentair Sta-Rite MasterTemp/Max-E-Therm Manifold Bypass Valve Kit (77707-0001) littlegiant A diffuser like this is

A diffuser like this is useful because it helps manage water movement after the impeller

Useful for restoring aeration performance and appearance

0 kW heater assembly for compatible Balboa VS100 spa applications

Vacuum switches are useful because they help the system respond appropriately to vacuum conditions that are part of normal operating or protection logic

Pentair Sta-Rite MasterTemp/Max-E-Therm Manifold Bypass Valve Kit (77707-0001) littlegiant A diffuser like this isThe 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