Zodiac Pool R0563000 Yellow Handnut for T5 Duo Pool Cleaner is a genuine Zodiac OEM replacement part. The T5 Duo utilizes the reliable Dura Life™ Diaphragm with one moving part to ensure a long lasting and easy to maintain cleaner. The Dura Life Diaphragm provides maximum durability and silent operation. The Duo Disc System achieves a closer clean with two independent discs for enhanced coverage, greater pool adhesion, and flexibility.