SKB62.006 Electrohydraulic actuator, AC 24 V, DC 0...10 V, 2800 N with spring return, with 6.20 mm stroke limiter. 
Key data to replacement product: Electrohydraulic actuator SKB62UA, AC 24 V, DC 0...10 V, 2800 N, 20 mm, similar functionality plus enhanced performance. 
Info: Operation with frost protection monitor QAF21.. or QAF61.. or remote setting unit FZA21.. requires SKD62UA (with spring return). Adjust stroke limit control to required stroke.