The B3373 riser clamps are available in a standard material and finish, as well as a felt lined riser clamp (B3373F) for copper tubing, a PVC coated riser clamp option (B3373C).
B3373 size range is 1/2" (15mm) to 30" (760mm) pipe
The B3373CT copper tubing riser clamps feature the Eaton Dura-Copper finish. The B3373CTC version features the Dura-Copper finish plus a PVC coated finish. They are available in size ranges from 1/2" (15mm) to 6" (150mm) copper tubing.
B3373F size range is 1/2" (15mm) to 21/2" (65mm) copper tubing
B3373C size ranges is 1/2" (15mm) to 6" (150mm) pipe