En Stock Available Service kits and O-Rings O-Rings for DIN regulator terminal 1.90 € Pack of 4 O-Ring for the DIN terminal of the regulator. There are two measures: 17mm outer diameter (option 1) 15mm outer diameter (option 2) And in two materials, standard or Viton. Choose the appropriate one for your regulator in the drop-down menus Add to cart