Does the switch look like this?

That's the Hayward switch. There's nothing special about it. It's a simple inductive switch with two wires connecting through an rj11 "phone" connector on the control board. When water flows through the line, it physically pushes the metal tab into the other lead and closes the electrical circuit. I got an aftermarket switch when I replaced mine last year, but I'm pretty sure I paid more than the Hayward part is going for on amazon now: http://www.amazon.com/Hayward-GLX-FL.../dp/B0030E3US2 .