Pentair PKG188 2" Half Union Adapter for Sta-Rite Pool or Spa (2 Pack) Half union adapter package replacement Fits Pentair Sta-Rite System 3 Modular Media SM-Series pool and spa inground filters models Also fits Pentair Sta-Rite System 2 Modular D.E. PLDE-Series pool and spa inground filter model LDE36, PLDE70 Compatible with Pentair Max-E-Therm, MasterTemp, Max-E-Pro pumps, Dyna-Pro pumps, Dyna-Glas/Dyna-Max series Measures 7-1/2-inch length by 5-3/4-inch height by 5-1/2-inch width