Trojan UVMAX C/D UV Quartz Sleeve: Replacement Sleeve for Trojan UVMAX PRO 20 systems. Sleeves must be wiped clean regularly. Replace sleeve if fouled or damaged.Specs Finish sort: Open Ended ID: 1.five” or 38mm ± .2mm OD: 1.65″ or 42mm ± .2mm Duration: 26.77″ or 680mm ± 3.5mm Genuine Viqua quartz sleeve for a Trojan UVMax PRO 20 model systems. The UV Max 602975 Quartz sleeve supplies thermal protection for the system UV lamp and protects it from imaginable water damage. User Manual