Simply ask for the spare parts list for your pump type, e.g. PP(HC) 41mm diameter (length does not matter here), where an exploded view of the respective pump tube is shown. The individual parts can be easily screwed on by hand. Please note that some of the threads are left-handed. If you have any questions, please do not hesitate to contact us. You can also send the pump tube or motor to us at any time for analysis and repair. Please note that both must be cleaned and free of chemicals/media. Please also enclose a brief description of the fault. Address: Dr Jessberger GmbH, Jägerweg 5, 85521 Ottobrunn. Please do not forget to include your contact person.