Bk Mueller 520-201HC 1/4 Inch 45 Degree Black Malleable Iron Elbow

Product Description

The BK MUELLER 520-201HC is a 45-degree threaded elbow fitting designed for low-pressure black iron piping systems. Manufactured from malleable iron with a black finish, it provides a durable directional change in gas, air, or liquid lines at a 45-degree angle. The fitting is Class 150 rated with a liquid and gas pressure rating of 300 psi and uses standard Female Iron Pipe (FIP) threading on both ends. Licensed plumbers and pipefitters install this type of fitting in residential and light commercial applications where precise directional routing is required without a full 90-degree offset.

This elbow is suited for use in natural gas distribution lines, compressed air systems, and water supply piping where a 45-degree change in direction is needed. The 1/4-inch FIP threaded connection makes it compatible with standard black iron pipe assemblies. It is commonly found in residential gas appliance connections, HVAC gas supply lines, and small-diameter compressed air runs. The black finish is standard for gas service piping and meets typical code requirements for above-ground, exposed gas piping installations.

Key Features

• Malleable iron construction provides strength and resistance to impact in threaded pipe assemblies
• 300 psi pressure rating supports gas, air, and liquid service at typical low-pressure distribution levels
• Class 150 classification meets standard requirements for residential and light commercial piping
• Female Iron Pipe (FIP) threading on both ends ensures compatibility with standard black iron pipe and fittings
• Black finish is code-appropriate for exposed above-ground gas service piping
• 45-degree angle allows directional changes with less flow restriction than a 90-degree elbow

Compatibility

Designed as an OEM-style replacement or new-installation fitting for standard 1/4-inch black iron threaded pipe systems rated at Class 150 or equivalent.

Installation Notes

Installation should be performed by a licensed plumber or pipefitter in accordance with local codes and the International Fuel Gas Code (IFGC) or International Plumbing Code (IPC) as applicable. Shut off all gas or fluid supply and verify zero pressure before disassembling or assembling threaded fittings. Apply listed thread sealant or pipe thread compound rated for the service medium to all male threads before makeup. Inspect threads for damage before assembly and do not overtighten, as malleable iron fittings can crack under excessive torque.