3 3/8" Scalloped Poly Jet Pulsator Gray-Black-White Poly Jet Internal, Pulsator, Text.5-Scallop, Black Manf. Waterway Plastics Manf. # 210-6521 Poly Jet Internal, Pulsator, Text.5-Scallop, Gray Manf. Waterway Plastics Manf. # 210-6527 Poly Jet Internal, Pulsator, Text.5-Scallop, White Manf. Waterway Plastics Manf. # 210-6520