Vacuum Relief Valve

Rheem SP623335 Vacuum Relief Valve – Essential Protection for Tank Integrity

The Rheem SP623335 Vacuum Relief Valve is engineered to protect water heater tanks from damage caused by vacuum conditions during system drainage or negative pressure events. Installed on the cold water inlet line, this valve helps maintain structural integrity by allowing air into the system when necessary, preventing tank collapse or distortion.

This component is recommended for use in water heaters without built-in vacuum relief or where required by local code. The SP623335 is an OEM-grade part manufactured to meet Rheem’s specifications and is approved for use with Rheem, Ruud, and Richmond brand units.

Professional-Grade Features

• Automatic Air Inlet – Opens under vacuum conditions to prevent structural damage to the tank
• OEM Specified – Factory-authorized replacement part for Rheem, Ruud, and Richmond systems
• Corrosion-Resistant Construction – Designed for durability in domestic water systems
• Standard NPT Threads – Allows straightforward connection to cold water supply lines
• Prevents Tank Collapse – Required in many jurisdictions to comply with plumbing code requirements

Technical Specifications

• Model Number: SP623335
• Function: Vacuum Relief (air intake upon negative pressure)
• Installation Location: Cold water inlet line (as close to the heater as practical)
• Thread Size: 3/4" NPT
• Compatible Brands: Rheem, Ruud, Richmond
• Warranty: 1-Year Limited Manufacturer Warranty

Installation Overview

Installation should be performed by a qualified professional to ensure proper placement and compliance with applicable codes. The valve is typically installed on the inlet side of the water heater, oriented in an upright position. Check local regulations, as vacuum relief valves are often mandated for electric water heaters without integral protection.

Applications

• Electric or gas storage water heaters without integrated vacuum protection
• Code-required installations for tank safety
• Service replacements in OEM-specified systems