5 Common Mistakes to Avoid When Using Brass Compression Fittings
Brass compression fittings are prized for their reliability and ease of installation, but even small errors can lead to leaks, system failure, or safety risks. Whether you're a DIY enthusiast or a professional plumber, avoiding these common mistakes is key to ensuring a secure, long-lasting connection.
1. Using the Wrong Pipe or Tubing
One of the most frequent errors is mismatching the fitting with incompatible pipe material. While brass fittings work with copper, PEX, and certain plastics, they are not suitable for all tubing types. For instance, using a standard brass ferrule with soft polyethylene tubing can cause the pipe to collapse under compression. Always verify the fitting manufacturer's specifications for approved pipe materials before installation.
2. Improper Pipe Preparation
A clean, square cut is non-negotiable. Cutting the pipe with a dull blade or a hacksaw often leaves burrs, jagged edges, or an angled end. This prevents the ferrule from seating evenly, creating a path for leaks. Always use a sharp, dedicated tube cutter, and thoroughly deburr both the inner and outer edges of the pipe before assembly.
3. Incorrect Ferrule Orientation
The compression ring (ferrule) has a specific orientation. Its tapered side must face the fitting body. Installing it backward-with the flat side facing inward-will prevent proper compression and result in an immediate leak. Double-check the ferrule direction as you slide it onto the pipe, a simple step that is often overlooked in haste.
4. Over-Tightening or Under-Tightening
Achieving the correct torque is critical. Over-tightening can crush the pipe, distort the ferrule, or crack the fitting body. Under-tightening fails to compress the ferrule sufficiently, leaving a gap. The best practice is to hand-tighten the nut until snug, then use wrenches for a final quarter to a half turn (90-180 degrees). Use one wrench to hold the fitting body and another to turn the nut to avoid twisting the pipe.
5. Reusing a Ferrule
A compression ferrule is designed for a single-use installation. Once compressed, it is molded to the specific pipe and fitting. Attempting to reuse an old ferrule on the same or a different pipe will almost certainly cause a leak, as the seal cannot be recreated. Always use a new ferrule when reassembling a connection.
By avoiding these five pitfalls-mismatched materials, poor pipe prep, incorrect ferrule orientation, improper tightening, and ferrule reuse-you can ensure that your brass compression fittings perform reliably for years to come. Taking the time to install them correctly saves costly repairs and protects the integrity of your entire plumbing system.
IFAN Factory
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The IFAN factory was established in 1993 and has a 120,000 square meter workshop with 610 employees. IFAN can design and produce all plumbing pipes and fittings, including PPR, PVC, CPVC, PPSU, HDPE, PEXA, PEXB, PERT, brass fittings, brass ball valves, heating systems, gas systems, faucets, and sanitary hoses.
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