Poly-B, or polybutylene, is commonly identified as flexible grey supply tubing marked with PB2110. It was installed in many Canadian homes from the late 1970s into the 1990s and deserves a deliberate inspection and replacement plan.
Do not open sealed fuel, electrical or pressurized equipment. If water is actively escaping or wastewater is present, call for service and keep clear of hazards.
Identify the material
Look at accessible mechanical-room and under-sink piping for grey flexible tube and PB2110 markings.
Check the whole system
A short visible section may not show every material used behind walls.
Review past leaks
Previous fitting failures or repairs help show how the system is aging.
Plan access carefully
A repipe strategy should limit openings while still replacing the intended runs completely.
Choose compatible replacement material
PEX and copper each have appropriate uses depending on access, budget and project goals.
Document the completed work
Photos, scope notes and material details can help with future maintenance and property records.
The practical next step
Use the evidence you can observe, then get the system assessed.
Photos, timing and which fixtures are affected can all help. A qualified inspection turns those observations into a repair or replacement recommendation.
