Edelstahlkrümmer zu61 RF/RX Graupner 2239A With Teflon connecting hose and two spring clips (expect No. 1009 A). Pipe O.D. 20 mm. Lightweight, thin-walled tubing. Very durable. Fits OS MAX 61 RF and RX motors with rear exhaust in UNI-EXPERT-MECHANICS or UNI-MECHANICS 2000. Weight with fittings approx. 86 g.