Taco Cast Iron Freedom flanges can be used with all "00" series Cast Iron Taco Circulator pumps. Sold in pairs. Each set features (2) Flanges, (4) Bolts and (4) Nuts. Specs: Product Specs Material: Cast Iron Application: Heating Type: Pump Flanges Thread Type: Female Connection Size: 1" Thread Size: 1" Connection Type: Threaded (IPS) Parts Used With: 00 Series Pumps (Except 0012) 110 Pumps 111 Pumps 112 Pumps 113 Pumps 1400-10 Pumps 2400-10 Pumps 2400-20 Pumps 1400-45 Pumps