Lutz Drum Pump Motors Include: B28, B36 / MI 4 or B36-SC / MI 4 E (Speed Control), B55-T-5 / MA II 5, B55-T-7 / MA II 7, MD-1 (Ex) / MD-2 (Ex), 4GT (Non-Ex), Silver Star ME I 6 (Ex), MA II 3-12 V, B4 / GT Continuous Duty