Yamitsu replacement quartz glass sleeves only suitable for Yamitsu Kockney Koi UV units.

Small size fits older 6 watt and new 11 watt model 30 mm OD x 215 mm Long

Medium fits 15 and 25 watt models also twin versions of these, 30 mm OD x 428 mm Long

Large fits 30 and 55 watt models also twin and multi versions of these. 30 mm OD x 887 mm Long