DWV system subject to freezing, you can pour RV antifreeze down the traps.

DWV system subject to freezing, you can pour RV antifreeze down the traps.

• A. True
• B. False
• C. Only in winter
• D. Not recommended

Answer: (A)

The key idea is protecting the water seals in the traps from freezing by using a non-toxic antifreeze in the DWV system. RV antifreeze (propylene glycol–based) is designed for winterizing plumbing and is safe for use in traps and drains, so pouring it into traps helps prevent the water in the traps from freezing and cracking during cold conditions. It’s important to use the RV/winterizing type, not automotive antifreeze, which is toxic and not meant for potable or plumbing use. This method is appropriate whenever freezing is possible, not just in winter, and it should be limited to traps and drain lines rather than potable supply lines.

The key idea is protecting the water seals in the traps from freezing by using a non-toxic antifreeze in the DWV system. RV antifreeze (propylene glycol–based) is designed for winterizing plumbing and is safe for use in traps and drains, so pouring it into traps helps prevent the water in the traps from freezing and cracking during cold conditions. It’s important to use the RV/winterizing type, not automotive antifreeze, which is toxic and not meant for potable or plumbing use. This method is appropriate whenever freezing is possible, not just in winter, and it should be limited to traps and drain lines rather than potable supply lines.