Symptoms
- Noticeably reduced flow to one specific fixture
- Visible sharp bend or crease in an accessible section of PEX
- Flow was normal before recent work in that area
- No leak, just restricted flow
Likely causes
- CommonSharp bend during installation exceeding the tubing's minimum bend radiusPEX is flexible but has a limit to how tightly it can bend before kinking and restricting flow internally.
- CommonTubing pinched by a fastener, stud, or other structural elementIf the tubing was routed too close to a nail, staple, or tight framing gap, it can compress and kink over time.
- PossibleKink introduced during a repair or renovation projectHandling tubing during nearby work can accidentally create a kink that wasn't there before.
What to do
- Locate the kinked section, which is often visible as a sharp crease or bend if the tubing is accessible.
- For a very minor kink in flexible PEX, sometimes gently working the area with your hands can partially restore roundness, though this doesn't always fully fix flow.
- For most kinks, plan to cut out the kinked section entirely using PEX cutters.
- Install a straight coupling fitting (crimp, clamp, or push-fit depending on your system) to rejoin the tubing with a new short section if needed to span the gap.
- Reroute the new section with a wider, gentler bend, respecting the tubing's minimum bend radius (often stated by the manufacturer, roughly 8 times the tubing diameter without a support elbow).
- Secure the tubing with proper clips or straps to prevent future kinking at tight spots.
- Turn water on and confirm flow has returned to normal at the affected fixture.
Tools and parts
- PEX cutters
- Crimp or clamp tool
PEX coupling fittingSearch: “PEX coupling fitting”
When to call a pro
Call a plumber if the kinked section is behind a wall or in a hard-to-access spot requiring more extensive opening up.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.