Arrowhead Brass 221LF 22 Series 3/4" Male Boiler Drain, Brass Valve

Arrowhead Brass 221LF 22 Series 3/4" Male Boiler Drain, Brass Valve

The Arrowhead Brass 221LF is a 3/4" male-threaded boiler drain valve from the 22 Series, engineered for rough-in plumbing applications where a low-profile, quarter-turn shutoff is needed for draining boilers, water heaters, and hydronic heating systems. The 22 Series lineup covers two closely related models — the 221LF and the 223LF — both sharing the same brass body construction, quarter-turn operation, and rough-in intent, with connection style being the point of differentiation across the pair. This 221LF variant installs directly into a 3/4" male threaded connection, giving plumbers and contractors a compact, reliable point of service for system drain-down and maintenance work. As a boiler drain, the 221LF is designed to be installed behind the wall or at the base of mechanical equipment where a dependable, low-lead brass valve is required for professional rough-in work.

Key Features

• Trade Size: 3/4" male threaded connection for direct installation into standard boiler, water heater, and hydronic system fittings.
• 22 Series Design: Compact quarter-turn boiler drain configuration built for straightforward system drain-down and routine maintenance access, available across the 221LF and 223LF models in the series.
• Male Connection Type: Male-threaded (MIP) end connection allows the valve to thread directly into a matching female fitting without additional adapters.
• Brass Construction: Brass valve body provides a durable, corrosion-resistant point of service for rough-in and mechanical room installations.
• Quarter-Turn Operation: Simplifies on/off operation for technicians performing routine system draining and service work.
• Low-Profile Rough-In Fit: Designed to sit flush behind walls or at the base of mechanical equipment for a clean, accessible service point.

Technical Specifications

• Product Type: Boiler Drain Valve
• Series: 22 Series
• Trade Size: 3/4"
• Connection Type: Male Threaded (MIP)
• Material: Brass
• Model Options: 221LF, 223LF

Typical Applications

• Boiler and Hydronic Heating System Drain-Down
• Water Heater Service and Maintenance Access
• Mechanical Room Rough-In Plumbing
• Residential and Commercial Heating System Installations
• Renovation and New Construction Mechanical Work

Why Arrowhead Brass?

Arrowhead Brass builds the 221LF boiler drain with a solid brass body for dependable performance in demanding mechanical room and rough-in environments. The 3/4" male-threaded, quarter-turn design gives plumbers and contractors a straightforward way to service boilers, water heaters, and hydronic systems without complicated hardware. Backed by the broader 22 Series lineup, Arrowhead Brass gives installers a consistent, dependable choice for rough-in drain valves. Choose Arrowhead Brass for rough-in valves built to stand up to the daily demands of professional plumbing work.