All Sterilight UV systems include a quartz sleeve, which surrounds the lamp. The quartz material used in R-Can's quartz sleeves are a 100% fused silica which lend to the sleeve's high transmittance. A high transmittance is important as the UV light must travel through the sleeve to get to the water.

There are a variety of quartz sleeve designs, depending on the system that they are being used in. The QS-330D is a domed quartz sleeve which is used in the Copper™ series only. All replacement sleeves are shipped with two 410867 O-rings.
The QS-330D Quartz Sleeve is compatible with the SSM-17, S2Q, VT4, VT4-DWS, SC4, SC4/2, S2Q-PA, S2Q-P/12VDC, and the S2Q-PV UV systems.