The Trojan 602855 is the correct replacement UV lamp for the following filter systems:
The Trojan 602855 - PRO-20 Replacement UV Bulb is compatible for use with the Trojan UVMAX Model H, H Plus, and PRO20 ultraviolet water filter systems. This Trojan UV light replacement helps your UVMAX system reduce Cryptosporidium and Giardia, bacteria, and viruses in your water. This Trojan UV bulb includes 2 O-rings and has a life of 18,000 hours. The Trojan UV lamp is environmentally friendly and highly efficient.
Trojan 602855 - PRO-20 Replacement UV Bulb specifications: