Myers Model ME40 Series - 4/10 HP Cast Iron Effluent & Drain Water Pump Series, 80 GPM. The Myers® ME40 series effluent pumps are one of the industry's most efficient models featuring a 4/10 HP motor. This powerful pump provides the flow and head required for demanding dosing systems and drainage applications. The ME40 incorporates cast iron, engineered thermoplastic and stainless steel in combination to produce a powerful and highly durable pump.