Dear Sir Madam, We're looking for this kind of filter, which serves also as a case. You can quote for the customized dimmensions of the attached doc, or for any design that you have already in stock. The wall of the filter has to have around 2mm of thickness, and we need it to have a inner thread of size M12. The length of the thread has to be, at least, 10mm, and it has to be built on high density non-porous PTFE (on the drawing we stated 12mm of high density PTFE, but it can be up to 18mm). The overall length of the cap has to be at least 40mm and no longer than 60mm. Please, I need a full quotation (for the 50 pieces and the shipment to Spain). Thank you in advance. Regards, Manuel