WAYNE EFL30 1/3 HP Cast Iron Submersible Effluent Pump With Piggyback Tether Float Switch Pumps up to 3900 gph at 0' Durable, cast iron submersible effluent pump Piggy-back tether float switch for automatic or manual operation 2" npt discharge capable of handling 3/4" solids Designed for easy installation without any plumbing changes Pumps up to 3900 GPH at 0' 2" NPT discharge capable of handling 3/4" solids Upper ball bearings for quiet operation Designed for domestic septic tank and gray water applications Piggy-back tether float switch for automatic or manual operation