3321AB Lead Free Brass Threaded Water Heater Isolation Valve Kit

Engineered for seamless integration into demanding plumbing systems, the 3321AB Threaded Isolation Valve Kit delivers code-compliant performance with fully threaded FNPT connections and a hot-side red handle for precise control in residential and commercial water heaters. Featuring a union body design and industrial-grade construction, this valve ensures leak-free operation under extreme pressures while adhering to strict lead-free standards.

Key Features & Benefits

✔️ FNPT x FNPT Threaded Union Body – ASME B1.20.1-NPT threads on both ends for solder-free, leak-proof installations and easy disassembly.
✔️ Hot-Side Identification (Red Handle) – Clearly distinguishes hot water lines, reducing installation errors in water heater systems.
✔️ 600 PSI WOG Industrial Rating – Full-port design with virgin PTFE seats maximizes flow and durability in water, oil, or gas applications.
✔️ Lead-Free Compliance – Meets California’s AB1953 and NSF-61/372 standards for safe potable water systems.
✔️ Union Body Convenience – Simplify maintenance without cutting pipes, saving time during repairs or upgrades.

Technical Specifications

• Connections: 3/4" FNPT x FNPT (ASME B1.20.1-NPT)
• Operation: ¼-turn with blow-out-proof stem
• Materials: Lead-free brass, PTFE seats
• Pressure Rating: 600 PSI WOG (non-shock)
• Handle Color: Red (hot water identification)
• Standards: NSF/ANSI/CAN 61, NSF-372, AB1953

Why Choose This Valve?

• Error-Proof Installation – Red handle ensures accurate hot-side placement in water heater setups.
• Durable Performance – Adjustable packing and industrial brass withstand thermal cycling and pressure surges.
• Zero Contamination Risk – Lead-free construction and PTFE seats comply with drinking water safety regulations.
• Contractor Efficiency – Pre-assembled union body design reduces downtime during maintenance.

Ideal Applications

• Residential and commercial water heater installations (hot-side)
• Hydronic heating systems with threaded piping
• Potable water supply lines requiring frequent maintenance
• Retrofit projects in multi-unit housing or commercial buildings
• High-pressure oil/gas shut-off applications

Built for Safety & Longevity

✅ AB1953 + NSF Certified – Safe for drinking water and compliant with lead-free regulations.
✅ Industrial Durability – 600 PSI rating handles extreme thermal and pressure stress.
✅ Pro-Approved Design – Trusted by contractors for reliability in critical systems.

Engineered for Precision – The go-to choice for professionals prioritizing threaded integrity and hot water safety.

All-Threaded | Hot-Side ID | Lead-Free

*3321AB: Red