V-Fittings deep heat while drastically enhancing circulation by drawing warmer surface water through strategically placed louvers thrusting it to the floor of the pool. Venturi enhanced circulation disrupts sediment from side walls and floor of pool increasing effectiveness of chemicals and swimming pool filters. Features . Reduce energy costs. Deep Heat in colder climates. Cooling in hotter climates. Maximize solar system performance. Improves overall water quality. Color - White. Size - 1.5 in.