Used on the Fleck 2310 Safety Brine Valve Assembly. 3/8" Tube x 48" Long, with air check at bottom which can be cut to fit. Installation Note: If you are only using this Air Check Assembly inside your brine tank, without a float assembly, you will need a 3/8" x 3/8" Fitting Elbow - # 12794 to connect brine tubing and brine pickup tube together.