This bulkhead ring adapter is designed to use with Pentair MiniMax CH pool and spa heater models 150 IID, 150, 200, 250, 300, 350, 400 and also compatible with MiniMax NT STD, NT LN, NT TSI pool and spa heaters models 200, 250, 300, 400. Also fits Pentair FullFlow D.E. and sand pool/spa valve models 263011, 263010. Available in black color. Measures 4-1/4-inch length by 4-1/4-inch height by 1-1/4-inch width.