Pentair 542528 Dark Gray Infusion Venturi V-Fitting - Pentair V-Fitting is an adjustable wall return enhanced with powerful venturi-assisted technology. Strategically placed along your pool walls, V-Fittings improve water flow, disburse chemicals and heated pool water evenly, and provide enhanced circulation. Adjustable nozzles can create a variety of pleasing water effects, such as fountains or ripples along pool surface.