All TrojanUVMax UV systems include a quartz sleeve, which surrounds the lamp. The quartz sleeve provides thermal protection for the UV lamp and protects it from possible water damage. The quartz material used in VIQUA 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. All VIQUA sleeves have been tested in order to ensure the VIQUA lamps deliver the appropriate intensity in each system that is offered. Make sure to GET GENUINE and always maintain your system with GENUINE parts from your VIQUA dealer. Systems used in: C, C+, C4, C4+, D, D+, D4, D4+ Description: Domed at one end Additional Details ------------------------------ Warranty description: Our commitment viqua is committed to ensuring your experience with our products and organization exceeds your expectations. We have manufactured your uv disinfection system to the highest quality standards and value you as our customer. Should you need any support, or have questions about your system, please contact our technical support team at 1. 800. 265. 7246 or technicalsupport@viqua. Com and we will be happy to assist you. We sincerely hope you enjoy the benefits of clean, safe drinking water after the installation of your viqua disinfection system. How to make a warranty claim note: to maximise the disinfection performance and reliability of your viqua product, the system must be properly sized, installed and maintained. Guidance on the necessary water quality parameters and maintenance requirements can be found in your owner’s manual. In the event that repair or replacement of parts covered by this warranty are required, the process will be handled by your dealer. If you are unsure whether an equipment problem or failure is covered by warranty, contact our technical support team at 1. 800. 265. 7246 or e-mail technicalsupport@viqua. Com. Our fully trained technicians will help you troubleshoot the problem and identify a solution. Please have available the model number (system type), the date of purchase, the name of the dealer from whom you purchased your viqua product (“the source dealer”), as well as a description of the problem you are experiencing. To establish proof of purchase when making a warranty claim, you will either need your original invoice, or have previously completed and returned your product registration card via mail or online.