Watkins No Fault Hot Springs PDR Heater Assembly. Low Flow Design that Fits most Hot Springs and Tiger River Spas from 1995 to Current. Titanium element. This Heater Style also replaces the old trumpet style heater assembly which is no longer made. Includes: 1/4" X 12" Vinyl Tubing, 1/4" Tubing Clamps, Thermistor O-Rings and Instructions.