SwitchCrafters.com does offer insulated frogs, however with the addition of two insulated rail joiners on the two rails coming from the frog point and a micro-switch at the points end, you now have an insulated frog. SwitchCrafters does offer a water-proof micro-switch with installation for $17 on any of their switches. You may want to call them at 541-990-4455. Hope this helps out.
