RS Syphon Drum Pump. Professional hand operated syphon pump that ‘s easy to fit and use and was designed for fluid transfer on 205 litre drums. Composite pump with self-priming feature Suitable for oils and non-aggressive chemicals ; 851-7556 851-7556 Delivery Rate: 17ltr/min ; 851-7559 851-7559 Delivery Rate: 21ltr/min