How to change a dip tube<br>Check when your water heater was manufactured. Nearly all gas and electric water heaters manufactured between 1993 and 1997 were installed with defective dip tubes. The dip tubes were made of a material that quickly degraded and disintegrated, causing dip tube failure.

Based on the paragraph above can we conclude that "Dip tubes are most often made out of rubber."?
It's impossible to say