G-QS-740 Replacement Sterilight QS-740 Quartz Sleeve for SP740-HO

Maintain the performance and reliability of your UV water treatment system with the G-QS-740 Replacement Quartz Sleeve, a premium compatible replacement for the Sterilight / Viqua QS-740. Manufactured from high-quality fire-polished fused quartz, this sleeve provides exceptional UV light transmission while protecting the UV lamp from direct contact with water.

Featuring a closed (domed) one-end design, the G-QS-740 is supplied complete with two replacement EPDM O-rings for a secure, leak-free installation. It is compatible with a wide range of Sterilight, Viqua, Evoqua and Pura Water UV disinfection systems.

Over time, mineral deposits such as limescale, iron and manganese can build up on the quartz sleeve, reducing UV transmission and lowering the effectiveness of your UV steriliser. Regular cleaning and scheduled replacement help maintain optimum UV output and ensure reliable protection against bacteria, viruses and other harmful microorganisms.

Features & Benefits

• Compatible replacement for Sterilight / Viqua QS-740
• Premium fire-polished fused quartz
• Closed (domed) one-end design
• Excellent UV light transmission for maximum disinfection performance
• Protects the UV lamp from direct water contact
• Supplied complete with 2 EPDM O-rings
• Precision manufactured for a secure, leak-free seal
• Easy to install during routine maintenance
• Cost-effective alternative to the OEM quartz sleeve

Technical Specifications

• Product Code: G-QS-740
• Replaces: Sterilight / Viqua QS-740
• Length: 872 mm
• Outside Diameter: 23 mm (22.5 mm nominal)
• Inside Diameter: 20 mm
• End Type: Closed (Domed) One End
• Material: Fire-polished fused quartz
• Supplied with: 2 × EPDM O-rings

Maintenance Recommendations

For optimum UV system performance:

• Clean the quartz sleeve every 6–12 months, depending on water quality.
• Remove mineral deposits using Calcium, Lime & Rust (CLR) remover or white vinegar.
• Replace the quartz sleeve every 2 years, even if it appears undamaged.
• Inspect the O-rings during servicing and replace them if worn or damaged.

Compatible UV Lamp

Designed for use with the Sterilight / Viqua S740RL-HO UV lamp.

Compatible UV Systems

Evoqua Water Technologies

• W2T376902

Pura Water Products

• 89512
• UVSS-15
• UVSS-15M

UV Superstore

• 89512-UV

Sterilight / R-Can

• QS-740
• S740RL-HO
• SC-740
• SCM-740
• SCMV-740
• SCV-740
• SP740-HO
• SPV-15
• SPV-740

Viqua

• QS-740
• S740RL-HO
• SC-740
• SCM-740
• SCMV-740
• SCV-740
• SP740-HO
• SPV-15
• SPV-740

This compatibility is based on published manufacturer cross-reference information for the QS-740 quartz sleeve.

The G-QS-740 is a premium compatible replacement quartz sleeve offering exceptional optical clarity, durability and long service life. Manufactured to high standards, it provides a cost-effective alternative to the original Sterilight / Viqua QS-740 while maintaining the UV transmission required for effective ultraviolet water disinfection.