The Trojan 602731 is the correct replacement quartz sleeve for the following systems:
The Trojan 602731 Replacement Quartz Sleeve - UV Max B provides thermal protection for the UV lamp against water damage. This Trojan replacement sleeve fits the Trojan UVMax B and B4 UV water disinfection systems, and ensures high UV light transmittance due to its 100% fused silica construction. This UV quartz sleeve is domed on one end and should be replaced when worn or broken.
Trojan 602731 Replacement Quartz Sleeve - UV Max B specifications: