Your search for "sleeve" revealed the following:

55W UV Quartz Sleeve & Replacement Bulb for our Water Purifier Ultraviolet Light

Bluonics 2Pck Quartz Sleeve Tube Replacement for Bluonics 110W UV Water Purifier Ultraviolet Light

Whole House UV Water Filter System 12 GPM – 55W Stainless Steel UV Light – LED Indicator & Alarm – Well & City Water – Includes 2 Extra Bulbs, Ballast & Quartz Sleeve – Bluonics

Bluonics Quartz Sleeve for 6W UV Water System, Closed-End Replacement Glass Tube for Under-Sink Drinking Water UV, RO Add-On or Stand-Alone Unit

Bluonics 6W UV Replacement Bulb & Quartz Sleeve Set for Under-Sink Drinking Water UV System, RO Add-On or Stand-Alone Unit

Whole House UV Water Filter System 12 GPM – 55W Stainless Steel UV Light System – LED Indicator & Audible Alarm – for Well & City Water – Includes 2 Extra Bulbs – Bluonics

20-pack 4.5" x 10" Big Blue Sediment Replacement Water Filters 5-Micron Whole House Cartridges for Rust, Iron, Sand, Dirt and Undissolved Particles

Whole House UV Water Filter System 24 GPM – 110W Stainless Steel UV Light – 1" NPT – LED Indicator & Audible Alarm – for Well & City Water – Includes 2 Ballasts – Bluonics

Bluonics 110W Whole House Water Filter System for Well & City Water, 4-Stage Water Filtration System with UV Water Treatment, Triple 20 x 4.5 Sediment & Carbon Filters, 1 Inch MNPT, 24 GPM

Whole House UV Water Filter System 12 GPM – 55W Stainless Steel UV Light – LED Indicator & Alarm – Well & City Water UV Purifier – 3/4" NPT – Bluonics

55W UV Replacement Ballast, 100-120V Electronic Power Supply with Green & Red LED Indicators, 4-Pin Connector for Compatible 55W & 110W UV Water Treatment Systems

Whole House UV Water Filter System 12 GPM – 55W Stainless Steel UV Light with Flow Switch Ballast – LED Indicator & Alarm – Well & City Water UV Purifier – Bluonics

Bluonics 110w whole house water filter system for well and city water with pre-filter, extra filter set and 2 extra uv bulbs, 4-stage filtration with uv water treatment, triple 20 x 4.5 filters, 1 inch mnpt, 24 gpm

Bluonics 6W UV Replacement Bulb for Under-Sink Drinking Water UV System, 4-Prong Lamp for RO Add-On or Stand-Alone Point-of-Use Unit

Bluonics Whole House Water Filter System for Well Water, 3 Stage Sediment Carbon Filters with 110W UV Light, 24 GPM, 20 x 4.5 Housings, 1 in NPT

OPEN-BOX 110W Ultraviolet Light Water Purifier 24GPM UV Sterilizer Large Home/Commercial For Killing Virus, Bacteria, Ecoli & Cryptosporidium

Bluonics 4-Stage Under-Sink Water Filtration System with 6W UV Lamp and Faucet – 1 GPM