Here is a Whirlpool refrigerant flow noise suppression kit. Instructions are included. The material is a mastic like substance.

photo of the item

 (sold out)

List price is about $19.

"The enclosed material will reduce the refrigerant flow noise on any frostless refrigerator."

Specifics:

  • brand: FSP
  • manufacturer: Whirlpool
  • part number: 4318168

Condition: New.