Taco 009-022RP is a replacement cartridge for selected Taco 009 series Bronze Circulators. Compatible with 009-BC2 009-BC2-W 009-BC4 009-BC4-1W 009-BC4-W 009-BF2 009-BF2-W 009-BF4 009-BF4-J 009-BF4-W 009-BF5 009-BF5-3 009-BF5A 009-BF5A-J 009-BF5-J 009-ZBF5 and 009-ZBF5-1.