RED-WHITE VALVE CORP.  |  SKU: 30078496  |  MPN: 3420RAB 3/4

Tankless Water Heater Isolation Valve Kit | 3420 LF Standard Body | FNPT x FNPT

$148.00
Size | BTU Rating | Min Order Qty (MOQ)
  • Lead-Free Certified – Meets NSF/ANSI/CAN 61 & 372 standards vs. non-certified generic valves
  • Integrated Relief Port – Optional 200K/500K/2.7M BTU pressure relief (unlike standard ball valves)
  • Dual-Function Design – Combines shut-off valve + drain/purge port in one unit
  • Fail-Safe Construction – Blow-out proof stem and adjustable PTFE packing for leak prevention
  • Temperature-Specific Handles – Red (3421AB) for hot systems / Blue (3422AB) for cold service

Ensure safe, reliable, and efficient water control with the Lead-Free Brass Tankless Water Heater Valve Kit from Red-White Valve Corp. Crafted from high-quality, lead-free brass that complies with ASTM B927 C27450 standards, this valve kit is designed for durable, long-lasting performance in residential and commercial water heating systems.

Key Features:

  • Lead-Free Construction: Made from lead-free brass, ensuring compliance with safety standards and minimizing health risks.
  • Corrosion-Resistant Design: Fully equipped with durable, plated brass balls and PTFE seats for smooth operation and long life.
  • Full Port & ¼ Turn Operation: Provides a complete, unobstructed flow and easy shut-off with a simple quarter-turn.
  • Adjustable Packing & Blow-out Proof Stem: Delivers reliable sealing and safety in high-pressure environments.
  • Integral Hose End Drain/Purge Valve & Relief Ports: Comes with an integrated drain valve and specific relief port options (up to 2.7 million BTU/hr) for system safety and maintenance.
  • Certified & Safe: Meets NSF/ANSI/CAN 61 & 372 standards, ensuring safe drinking water compatibility.
  • Versatile Compatibility: Available in various configurations, including hot (red handle) and cold (blue handle) operation options.

Specifications:

  • Pressure Rating: 600# WOG (non-shock)
  • Temperature & Relief Capabilities:
    • 3420RAB: 200K BTU/hr relief
    • 3420SAB: 500K BTU/hr relief
    • 3420TAB: 2.7M BTU/hr relief
  • Materials: Lead-Free Brass, PTFE, EPDM, Aluminum, Steel

This product is perfect for installing or upgrading tankless water heating systems, providing peace of mind with its corrosion resistance, safety certifications, and ease of operation. Whether for residential or commercial use, these valves help ensure your water system runs smoothly and safely.

D i m e n s i o n , W e i g h t

Size Φ [in] ΦSC [in] ΦP [in] A [in] B [in] C [in] H [in] Wt.* [lb]
3/4 3/4 - 14 NPT 3/4 - 14 NPT 0.73 4.06 2.35 1.14 1.66 1.71 / 1.60
1 1 - 11.5 NPT 3/4 - 14 NPT 0.98 4.34 2.54 1.35 2.11 1.92 / 1.80
*3421AB / 3422AB

M a t e r i a l

# 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 B124 C37700
8 T-handle Aluminum ASTM B85
9 Handle nut Steel / Zn Plated ASTM A36
10 Handle screw Steel / Zn Plated ASTM A36
11 Handle Aluminum ASTM B85
13 Union nut Brass ASTM B283 C37700
14 Union Lead Free Brass ASTM B927 C27450
15 O-ring EPDM Perox NSF approved
16 Cap retainer Rubber -
17 Drain cap Brass ASTM B283 C37700
18 Drain gasket EPDM Perox NSF approved
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