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 systems full functionality without removing the entire adapter. One end has a 22mm inner diameter (ID) connection, and the other end has a 22mm outer diameter (OD) connection, compatible with 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 13 mm error due to manual measurement. 2. Color may vary slightly due to monitor display settings.