Mer-Made Hand Knob [Filter, Fits 4/6/8 Fiberglass Strainers] (K6512) sandfilters When an output-level relay board

When an output-level relay board begins to fail

Helps transition between threaded and slip plumbing sections

Supports more complete pump restoration

The M7 design adds further value by matching the heater platform many compatible Balboa systems were built to use

Improves repair organization and fit confidence

Mer-Made Hand Knob [Filter, Fits 4/6/8 Fiberglass Strainers] (K6512) sandfilters When an output-level relay boardThe Mer Made hand knob is designed for compatible fiberglass strainer applications where the knob needs replacement for opening, closing, or securing the strainer assembly. A hand knob is useful because it provides an easier grip point for manual adjustment, supporting cleaner service and more convenient maintenance. This replacement is especially useful when the original knob is cracked, stripped, broken, worn, or missing. Matching the correct fit