https://www.google.com/search?q=volcano+heater+block&oq=volcano+heater+bloc&aqs=chrome.0.0j69i57j69i60j0l2.4254j0j7&client=ubuntu&sourceid=chrome&ie=UTF-8
Dimensions 20x24x12 mm:
https://www.google.com/url?sa=i&source=images&cd=&ved=2ahUKEwjC5-XqpPLlAhUDEawKHYygB-EQjRx6BAgBEAQ&url=https%3A%2F%2Fwww.aliexpress.com%2Fitem%2F32904209042.html&psig=AOvVaw12jmnQLFFIZHVFRPwyFGBh&ust=1574115900032571
