Colonial Engineering has introduced two series of replacement cartridges for True Union Ball Valves. The CCR series fits Nibco Chemtrol Tru-Bloc TUBVs while the VCR series fits Colonial Full Block series TUBVs. Both series of cartridges are available in PVC & CPVC with EPDM or FKM o-rings and PTFE seats and are designed body threads and face-to-face dimensions to engage with the union nuts of the existing, installed valve. Included with the cartridges are new face o-rings.