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
Size | Φ [in] | A [in] | H [in] | P [in] | Wt. [lb] |
---|---|---|---|---|---|
¾³ | ¾ - 14 NPT | 3.54 | 1.66 | 0.73 | 0.92 |
Part | Material | Specification |
---|---|---|
1 | Body | Lead Free Brass ASTM B927 C27450 |
2 | Fixed end | Lead Free Brass ASTM B927 C27450 |
3 | Ball | Lead Free Brass / Cr plated ASTM B927 C27450 |
4 | Seat | PTFE PTFE |
5 | Stem | Lead Free Brass ASTM B927 C27450 |
6 | Packing ring | PTFE PTFE |
7 | Packing nut | Brass ASTM B283 C37700 |
8 | T-handle * | Aluminum ASTM B85 |
9 | Handle nut | Steel /Zn plated ASTM A36 |
10 | Union nut | Brass ASTM B283 C37700 |
11 | Union | Lead Free Brass ASTM B927 C27450 |
12 | O-ring | EPDM Perox NSF approved |
*3321AB: Red