RED-WHITE VALVE CORP.  |  SKU: 30078523  |  MPN: 3321AB 3/4

3321AB Lead Free Brass Threaded Water Heater Isolation Valve Kit

$54.00
  • FNPT x FNPT Industrial Threading – ASME B1.20.1-compliant threads ensure leak-proof, solder-free reliability in high-pressure oil/gas and water systems.
  • Hot-Side Red Handle Precision – Eliminates installation errors in commercial/residential water heaters, optimized for multi-unit housing.
  • 600 PSI Thermal & Pressure Resilience – Full-port PTFE seats handle extreme thermal cycling and pressure surges in hydronic/heating applications.
  • Contractor-Driven Union Design – Disassemble without pipe cutting, paired with ¼-turn operation for rapid maintenance in critical systems.

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