Wayne CDU1000 Cast Iron & Stainless Steel Submersible Sump Pump, 1 HPWayne Submersible Sump Pump features energy efficient motors, and engineered design provides the ultra quiet experience you won't believe. Corrosion resistant stainless steel and rugged cast iron construction, for long life in tough sump sump applications. No need for weep holes, unique top suction design reduces clogging and prevents air lock condition. 1 HP Pumps up to 4600 GPH @ 0' Cast iron stainless steel No need for weep holes, unique top