Ball Valve with Drain & Relief Port | 3420AB Series | FNPT × FNPT | Full Port | Lead-Free Brass
Ball Valve with Drain & Relief Port | 3420AB Series | FNPT × FNPT | Full Port | Lead-Free Brass
RWV 3420AB Series Union Ball Valves provide a premium, lead-free isolation solution for tankless water heater installations and other hot or cold water systems requiring built-in service access. Each valve combines a full-port design, drain and relief ports, and 600 PSI WOG rating in a compact union body configuration for simple installation and dependable performance.
Available in 3421AB (Hot) and 3422AB (Cold) standard or long-body configurations, these valves deliver durable, precision control while meeting the latest NSF-61, NSF-372, and AB1953 potable water standards. They are ideal for both residential and light-commercial hydronic applications.
Key Features & Benefits
- Hot & Cold Versions — Red handle (3421AB / 3421LAB) for hot side and blue handle (3422AB) for cold side identification.
- Full-Port Flow Design — Ensures unrestricted flow and minimal pressure drop for maximum system efficiency.
- Built-In Drain & Relief Ports — Includes ¾″ NPT relief port and purge cap for easy maintenance and service.
- 600 PSI WOG Rating — Handles high-pressure water, oil, and gas systems (non-shock).
- Lead-Free Certified — Complies with AB1953, NSF/ANSI/CAN 61 & 372 for safe potable water use.
- Quarter-Turn Operation — ¼-turn handle with blow-out-proof stem and adjustable PTFE packing for long-term reliability.
- Durable Brass Construction — Made from ASTM B927 C27450 lead-free brass with PTFE seats and EPDM seals.
Technical Specifications
| Connection | Operation | Material | Pressure | Available Sizes |
|---|---|---|---|---|
| FNPT × FNPT (ASME B1.20.1) | ¼-Turn | Lead-Free Brass, PTFE Seats, EPDM Seals | 600 PSI WOG (Non-Shock) | ¾″ & 1″ (Standard or Long Body) |
Dimensions & Weight
| Size | Φ [in] | ΦSC [in] | ΦP [in] | A [in] | B [in] | C [in] | H [in] | Weight [lb] |
|---|---|---|---|---|---|---|---|---|
| ¾″ | ¾-14 NPT | ¾-14 NPT | 0.73 | 4.06 | 2.35 | 1.14 | 1.66 | 1.71 / 1.60 |
| 1″ | 1-11.5 NPT | ¾-14 NPT | 0.98 | 4.34 | 2.54 | 1.35 | 2.11 | 1.92 / 1.80 |
Material Construction
| Part | Material | Specification |
|---|---|---|
| Body | Lead-Free Brass | ASTM B927 C27450 |
| Fixed End | Lead-Free Brass | ASTM B927 C27450 |
| Ball | Lead-Free Brass, Chrome-Plated | ASTM B927 C27450 |
| Seat | PTFE | PTFE |
| Stem | Lead-Free Brass | ASTM B927 C27450 |
| Packing Ring | PTFE | PTFE |
| Packing Nut | Brass | ASTM B124 C37700 |
| T-Handle | Aluminum | ASTM B85 |
| Handle Nut | Steel, Zinc-Plated | ASTM A36 |
| Handle Screw | Steel, Zinc-Plated | ASTM A36 |
| Handle | Aluminum | ASTM B85 |
| Union Nut | Brass | ASTM B283 C37700 |
| Union | Lead-Free Brass | ASTM B927 C27450 |
| O-Ring | EPDM Peroxide | NSF Approved |
| Cap Retainer | Rubber | - |
| Drain Cap | Brass | ASTM B283 C37700 |
| Drain Gasket | EPDM Peroxide | NSF Approved |
3421AB / 3422AB – Standard & Long Body | Hot & Cold Options | Lead-Free | Full Port | 600 PSI WOG
Warning (California Prop 65): This product can expose you to chemicals including lead, known to the State of California to cause cancer, birth defects, or other reproductive harm. For more information, visit www.P65Warnings.ca.gov.