I purchased this suction tube as a replacement, but I can now blow my nose, so I am selling it. Compatible with S-502, S-503, and S-504. Please make sure this is the correct item for you. It is new and unused. When shipping, I will flatten the tube to fit within 3 cm, so I will need to handle it slightly. Although it is new and unused, please understand that it has been stored at home. Returns are not accepted after purchase. Please comment if you have any questions. Thank you.