ML Extension Ring25 ML Intermediate Ring 25 ¥19,000 (tax included ¥20,900) Part Number: 30122 Purchased new and used for approximately 100 dives. Sold as a set of 2. Selling one for ¥6,000. Please comment if you are interested. Specifications [Size] Maximum diameter 97mm x depth 36mm [Weight] 111g [Depth Rating] 100m [Material] Corrosion-resistant aluminum alloy (anodized) [Length from mounting surface to port tip] 25mm (with port lock mechanism) Please understand that this is a used item before purchasing.