Heat is never good for the fuel system and this 3 bolt phenolic spacer insulates the fuel pump from the heat of the engine or the oil pump if driving the fuel pump on the end of the oil pump.
Spacer is .140" thick, uses 2.210" male and female register front and rear and will work with Waterman, Hilborn, DSR, Enderle or Kinsler three bolt flange fuel pumps.