Pentair Coil/Tubesheet O-Ring Package | 77707-0117 GAME A clogged or damaged orifice

A clogged or damaged orifice can cause uneven heating or ignition failure

aligning with the skimmer throat and return lines

replacing only the knob may not solve the problem

Replaced when network communication drops or fails

It helps control water movement between the skimmer and connected equipment

Pentair Coil/Tubesheet O-Ring Package | 77707-0117 GAME A clogged or damaged orificeWhat This Part Is Used For Pentair 77707 0117 Coil Tubesheet O Ring Package is a replacement sealing kit used in compatible Pentair heater assemblies. It provides O rings for sealing the coil and tubesheet connections. Why This Part Matters Worn O rings can cause internal heater leaks and pressure loss. Replacing them restores proper sealing and helps prevent water intrusion into critical components. This is especially important during heater rebuilds