Description
Protect your hot-water heating and hydronic boiler system with the Conbraco 10-408-05 — a high-quality, capacity-certified relief valve designed for safe, reliable operation in residential and commercial hydronic systems.
Key Features
- ¾″ female NPT inlet × ¾″ female NPT outlet for versatile installation into standard ¾″ piping systems.
- Factory-set to relieve at 30 PSI, helping safeguard hot-water boiler systems from over-pressure caused by thermal expansion or control failure.
- Certified capacity to handle up to 535,000 BTU/h, making it suitable for many mid-size commercial hydronic systems.
- Durable bronze (ASTM B584) body with corrosion-resistant design, silicone seat, stainless steel spring for long service life.
- Rated for hot-water service up to approximately 250 °F (121 °C) — ideal for modern hydronic heating systems.
- Manufactured to meet the requirements of American Society of Mechanical Engineers (ASME) Section IV for hot-water boilers, providing assurance of quality and compliance.






