Bk Llc 104-513 Brass Frost Free Anti-siphon Sillcock 1/2 in

Product Description

The BK LLC 104-513 is a brass anti-siphon frost-free sillcock valve designed for outdoor water supply applications in residential construction and service work. It connects via 1/2-inch male iron pipe thread (MPT) or copper sweat (SWT) on the supply side and terminates at a 3/4-inch male hose thread (MHT) on the outlet. The 6-inch barrel length keeps the valve seat inside the conditioned wall cavity, allowing the body to drain automatically when the supply is shut off and the hose is removed or left open. A built-in backflow preventer blocks back-siphoning into the potable water supply. Multi-turn operation gives the installer precise flow control.

This sillcock is suited for new residential construction, remodels, and replacement service on exterior wall hose bibs in freeze-prone climates. The frost-free design protects against burst pipes by ensuring standing water does not remain in the exposed barrel after shutoff. The integral anti-siphon device eliminates the need for a separate vacuum breaker at this connection point, streamlining rough-in and inspection. Typical installations include single-family homes, townhomes, and light commercial buildings where an outdoor hose connection is required at an exterior wall.

Key Features

• Frost-free 6-inch barrel keeps valve seat inside the heated wall cavity to prevent freezing
• Built-in anti-siphon backflow preventer protects potable water supply without a separate vacuum breaker
• Auto-draining design: barrel clears when supply is shut off and hose is removed or open
• Dual inlet options: 1/2-inch MPT or 1/2-inch copper sweat (SWT)
• 3/4-inch MHT outlet accepts standard garden hose fittings
• Multi-turn valve operation for controlled flow adjustment
• Full brass construction for corrosion resistance in outdoor service

Compatibility

Designed as an OEM-style replacement or new-install sillcock for residential and light commercial exterior walls requiring a 1/2-inch nominal supply connection via copper sweat or male iron pipe thread.

Installation Notes

Installation is performed by a licensed plumber and must comply with applicable local plumbing codes and the International Plumbing Code (IPC) requirements for outdoor hose connections and backflow prevention. Shut off the main water supply and relieve line pressure before beginning work. For sweat connections, ensure the pipe is fully dry before applying heat; for threaded connections, use an appropriate thread sealant rated for potable water. Do not cap or restrict the anti-siphon vent port, as this will defeat the backflow protection function.

Technical Specifications

• Inlet Size: 1/2 inch
• Inlet Connection Type: MPT (Male Iron Pipe Thread) or SWT (Copper Sweat)
• Outlet Size: 3/4 inch
• Outlet Connection Type: MHT (Male Hose Thread)
• Barrel Length: 6 inches
• Material: Brass
• Operation Type: Multi-Turn
• Anti-Siphon: Built-in backflow preventer
• Package Quantity: 24 per package
• Package Weight: 33.84 pounds
• Country of Origin: China

Standard Information

• Brand: BK LLC
• Manufacturer Part Number: 104-513