Yellow mouthpiece holder, perfect for an octopus regulator. For those with the right size! I bought two thinking they would fit anything, but... The mouthpiece diameter of my regulator is 2.7mm wide x 1.3mm (or wider) to fit. (Measured roughly) As shown in the instructions (photo 5), it hooks onto the biting part of the mouthpiece. Use it like in photos 3 and 4. This item does not fit the TUSA SS0003J. For reference, it fits Bism. Below is the product description from the store where I purchased it: - Brand: PRODIVE - Product Name: MOUTHPIECE HOLDER - Model Number: AS-MH-02-YL - Color: Yellow - Price: ¥660 (tax included) This product is used to attach the mouthpiece holder to the BC's D-ring and secure the octopus regulator. When in use, the octopus regulator can be easily detached by pulling it, allowing for quick use in emergencies. Thank you for viewing. * When shipping, I will remove it from the box and wrap it in bubble wrap. Thank you. #DivingAccessories #OctopusHolder