3/4" Cast Copper Boiler Drain Valve, Non Potable, Male (or Copper) x Hose

NIBCO® 74-CL-3/4 Multi-Turn Boiler Drain Valve – 3/4" Cast Copper Alloy

The NIBCO® 74-CL-3/4 Boiler Drain Valve is a multi-turn, cast copper alloy valve designed for residential and light commercial low-pressure water systems. Built for durability and precision control, this valve is ideal for draining water heaters, boilers, and supply lines during service or seasonal shutdowns.

Engineered for Dependability and Flow Control

This valve features a multi-turn operating handle that allows for accurate regulation of flow during system maintenance or drainage procedures. Its MIP (male iron pipe) inlet threads offer secure connections to compatible fittings, and the standard 3/4” hose thread outlet provides direct hookup to drain hoses for clean, efficient operation. NIBCO’s durable cast copper alloy body resists corrosion and ensures performance across a wide range of plumbing environments.

Key Features

• Cast Copper Alloy Construction – Built for corrosion resistance and mechanical durability in potable water systems.
• Multi-Turn Handle Operation – Provides smooth, precise flow control.
• Threaded Hose Outlet – Accepts standard 3/4" hose connections for easy drainage.
• Male Inlet Thread – Connects directly to threaded boiler or tank fittings.
• Dezincification-Resistant Material – Suitable for aggressive water conditions.

Technical Specifications

• Valve Model: NIBCO® 74-CL
• Size: 3/4 inch nominal
• Inlet Connection: 3/4" MIP
• Outlet Connection: 3/4" Hose Thread
• Pressure Rating: 125 PSI non-shock, cold water
• Temperature Rating: 180°F maximum
• Material: Cast copper alloy body with steel handle
• Warranty: 2-year limited (manufacturer)

Installation Requirements

This valve is designed for horizontal or vertical installation on low-pressure systems. Ensure proper sealing compound or thread tape is used on the male threads to achieve a watertight connection. Valve should be fully closed prior to pressure testing. Installation by a licensed professional is recommended to ensure compliance with local plumbing codes and to avoid improper orientation or over-tightening.

Built for the Jobsite

The NIBCO 74-CL-3/4 boiler drain is a trusted choice for contractors seeking reliable, straightforward solutions for draining equipment and system piping. Its compact profile and solid construction make it a staple in service vans, maintenance kits, and mechanical rooms across the industry.