1. Water Filter housing broken if you have one
2. Water Pump head
3. Icemaker/water valves on residential refers
4. Icemaker feed line and valve on RV refer Icemakers
5. Clothes Washer hot and cold valves
6. various elbows and t connections on the water lines
7. Toilet Water valve
8. ANY lines that expand too much and crack, depending on how cold and long
9. Outside Water Faucet
10. The Black Tank Flush air gap valve
11. Some Faucets---the necks that go up and roll over 180 degrees for the spout. The water stays in the spout and freezes Doug