Rule Pumps offers many design features while keeping size and cost to a minimum. Especially popular on smaller craft,

Rule 360 pump = 3/4" (19mm)  discharge outlet:  12Volts DC. Round design (pic 1)
Rule 500 pumps = 3/4'' (19mm) discharge outlet. 12 Volts DC (round design pic 1)
Rule 800 pumps  = The square model (20F) offers 36 mounting variations as well as a gas resistant strainer base. 3/4" (19mm) discharge outlet. 12 Volts DC (pic 2)

Rule-Mate 500 = • All-in-one pump & switch - No float switch required • Pump turns on when water level rises & shuts off when water is removed • Snap-off strainer for easy cleaning • Anti-Fouling Impeller• All-in-one pump & switch - No float switch required • (pic 3)

Rule Float switch switch =turns water on when level reaches 2", turns pump off when level reached 3/4"