This is the classic first stage regulator "Calypso" from Aqualung. With a simple piston design, it is highly durable and a reliable model with excellent maintainability. ■ Product Details Manufacturer: AQUALUNG Model: Calypso (First Stage Only) Type: High-Flow Standard Piston Number of Ports: HP Port x 1, LP Port x 4 ■ Condition & Maintenance Number of Dives: Approximately 100 Condition: Used. The brass chrome plating on the exterior is peeling, and there is a general feeling of use. This product is for those who prioritize practicality. Maintenance: Overhauled in December 2022. Unused since the overhaul. Operational Check: Functionality confirmed in February 2026 by connecting to a tank. Air supply was confirmed to be normal. ■ Important Notes Although unused since the overhaul, more than 3 years have passed since the last maintenance. For safety, please have it inspected at a dive shop or have it overhauled as necessary before use.