MARES AST 1ST STAGE DRY SYSTEM – INT, Regulator First StageMares AST 1st Stage Dry System INT Enhanced Protection for Your Regulator The Mares AST 1st Stage Dry System INT provides advanced protection for your regulators first stage, keeping internal components dry and free from contaminants. Designed with Mares Auto Sealing Technology (AST), it automatically seals the system when disconnected, preventing dust, salt, and moisture from entering ideal for both recreational and professional divers. AST (Auto