Potterton Relay 2 Pole. Eight Pin 640704
This is used on Netaheat Mk1 BF 10/16, 16/22
Ref: 640704
Potterton Relay 3 Pole 11 Pin 6013 IMO 640797
This is used on Netaheat MK2 10/16, 16/22. Netaheat Mk2F 10/16, 16/22
Ref: 640797