Features: This Oxygen Connector Adapter connects oxygen tubing from any tank or concentrator to your CPAP or BiPAP machine. The Oxygen Enrichment Connector Adapter includes a capped O2 port, allowing you to seal the connector when not in use, maintaining your CPAP system’s full functionality without needing to remove the adapter. One end has a 22mm ID connection and the other a 22mm OD connection, designed to fit standard CPAP tubing. This item is latex-free and made of durable plastic to resist breakage. Specifications: Material: Plastic Size: 5.1 x 2.2 cm Color: Transparent Quantity: 1 Piece Package Includes: 1 x Connector Adapter with Cap Note: 1. Please allow 1-3mm error due to manual measurement. 2. Color may vary slightly from the actual product due to screen display differences.