H-44444WPR WEBS ISOLATOR EXP E2 W/ 150 PRV 1"IPS LEADFREE 1982292

H-44444WPR Webstone Isolator EXP E2 with 150 PSI Pressure Relief Valve

The Webstone H-44444WPR Isolator EXP E2 is a professional-grade service valve kit designed for tankless water heater installations. This integrated system simplifies isolation, flushing, and maintenance procedures while ensuring full-port flow control. Constructed from lead-free brass, the assembly meets current low-lead legislation requirements and supports water, oil, and gas service applications. The kit includes a 150 PSI pressure relief valve and is designed for 1" IPS connections.

Technical Specifications

• Manufacturer: Webstone, a brand of NIBCO
• Model Number: H-44444WPR
• Series: 4444 (Isolator EXP E2)
• Nominal Size: 1 inch (IPS)
• Connection Type: Threaded Female NPT, Full-Port Ball Valve
• Body Material: Lead-Free Brass
• Port Type: Full Port for Unrestricted Flow
• Working Pressure: 500 PSI WOG (Water, Oil, Gas)
• Relief Valve Rating: 150 PSI
• Handle Type: Combination Lever/Wing Handle Actuators
• Operating Temperature Range: Up to 100°F (38°C) continuous service
• Media Compatibility: Water, Oil, and Non-Corrosive Gas Systems
• Includes:
  • Hot and Cold Isolator Valves with Service Ports
  • Pressure Relief Valve (150 PSI)
  • Drain/Flushing Connections
• Compliance: NSF/ANSI 372 (Lead-Free), CSA and UL Certified
• Application: Tankless water heater installation, maintenance, and system service isolation

Professional Notes

The Webstone H-44444WPR Isolator EXP E2 system is designed for professional installation in tankless water heater systems, providing a compact and code-compliant means for isolation and flushing. Its lead-free brass construction ensures durability under continuous operating pressure, while full-port ball valves minimize flow restriction. The integrated service ports and relief valve allow for controlled maintenance, draining, and pressure management without disassembly. Installation should follow manufacturer torque and alignment specifications for optimal sealing and performance.

Summary

The Webstone H-44444WPR Isolator EXP E2 is a 1" IPS lead-free brass service valve kit with full-port flow and a 150 PSI pressure relief valve. Rated for 500 PSI WOG and engineered for professional tankless water heater installation, it provides reliable isolation, flushing, and service capability in water, oil, and gas systems.