Plumber Red Seal · Question
When cold expanding PEX-a pipe for a connection, what is the critical time consideration immediately after expansion and before inserting the fitting?
For cold expansion PEX-a fittings, the fitting must be inserted immediately after expansion while the pipe-end is still dilated. Waiting for the pipe to contrac
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Question: When cold expanding PEX-a pipe for a connection, what is the critical time consideration immediately after expansion and before inserting the fitting?
Answer options:
- Wait for the pipe to fully contract to its original size. ✅ Insert the fitting immediately while the pipe is expanded.
- Allow the pipe to cool for 5 minutes.
- Apply a lubricant to the fitting for easier insertion.
Correct answer: Insert the fitting immediately while the pipe is expanded.
Explanation: For cold expansion PEX-a fittings, the fitting must be inserted immediately after expansion while the pipe-end is still dilated. Waiting for the pipe to contract or cool will make fitting insertion impossible as the PEX-a 'memory' will cause it to return to its original size, and lubricant is not required or recommended.
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