My pipes are grey. Is that always Poly B?
The straight answer
No. Grey PEX exists, and some Poly B is off-white or silver-grey. Colour alone proves nothing; the print string on the pipe wall does. Poly B carries PB2110 in its marking, PEX carries ASTM F876/F877.
The longer version
No, and this catches a lot of people: PEX is sold in grey too, and Poly B itself ranges from light grey to off-white to silver. Ignore the colour and read the pipe. Every run has a print string on the wall: Poly B says PB2110, PEX references ASTM F876 or F877. The identification guide shows exactly where to look in your home and what each marking looks like, photo by photo.
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