A Hex Frog Juicer can control up to 6 turnout frogs or three reverse loops or wyes. They are also the best option for wiring a double crossover. A Dual Frog Juicer can control two turnout frogs or a single reverse loop or wye. They are also suitable for operating the frogs of a crossing. A Mono Frog Juicer will control a single turnout frog.