This is a Type F mini oil filter housing cap. Genuine Part Number: 11428575907 I had this as a spare in case I damaged the cap drain when replacing it myself. I replaced the cap drain with a more durable 16mm one and tightened it with the correct torque. It's new. The genuine part number is shown in the photo. It applies to filters with four claws. It's reassuring to have as a spare in case of emergency. I bought it on Yahoo! Shopping for around 8,000 yen.