Deep Well Hand Pumps with Single Nitrile Cup Washer has a 50mm diameter pipe with interchangeable nitrile bobbin valves and can be installed on 100mm bore wells. The Deep Well Hand Pumps are equipped with pipe centraliser and monolithic piston and foot valve assembly which require no tools for servicing. The Deep Well Hand Pumps are suitable for use upto 60 meters with a PVC riser pipe option. Deep Well Hand Pumps with Single Nitrile Cup Washer can use unlined well and with its compact design can run for a longer period of time.