Frost plugs for engine block, for example when replacing engine heater elements. Available in 22mm, 26mm, 29mm and 36mm. OE 22mm: 2060661 / OE 26mm: 2060668 / OE 29mm: 2060663 / OE 36mm: 2060946 Fits: Kadett 1200 (22mm), CIH engine (29mm), later CIH 2.0 (36mm)