Apollo-Conbraco – 40-009-02 – 2 1/2″ – 3″ – Second Check Module for the 40-200

2 1/2″ – 3″ – Second Check Module for the 40-200 Reduced Pressure Zone *OR* First or Second Check Module for the 40-100 Double Check *OR* Second Check for the 3″ 40-600 Double Check Detector Assembly

Kit Includes: Check Assembly and Cover O-Ring