Thread connection: 9/16 Application: Check valve for a second-stage mid-pressure hose with a 16/9 adapter; opens and closes Material: Brass mid-pressure check valve, high quality, robust and durable Product name: Check valve, pressure valve for the mid-pressure hose of the second stage Key benefits - Prevents backflow in the mid-pressure hose to protect the regulator and maintain stable performance - Brass construction offers corrosion resistance and long service life in demanding marine environments - Simple to install with a standard 9/16 thread - Reliable protection for second-stage systems in diverse diving conditions Specifications and compatibility - Thread: 9/16 - For: Second-stage mid-pressure hose with 16/9 adapter - Type: Check valve (Rückschlagventil) for mid-pressure applications Use scenarios - Recreational scuba diving: replace a worn or leaking mid-pressure check valve to restore regulator reliability - Dive shop or rental fleet maintenance: ensure mid-pressure hoses remain protected from backflow for safe operation - Technical diving setups: maintain mid-pressure integrity in demanding environments where regulator performance is critical Note: Designed to fit standard 9/16 connections and compatible with 16/9 adapter configurations.