Solo/K&N airfilter.
Solo partnumber: 2500580
Schempp-Hirth partnumber: T20-2500845
Previously this was the RP-5164 (cylindrical with CFRP top), but this is no longer available and has been replaced by the R-1060 (with standard top) or RC-1060 (with Chrome top).

Suitable for self-launcher with Solo engine:
2625 02i (Ventus-3M, Arcus-1.0M, Arcus-2.0M)

Di=49mm
Do=76mm->51mm
L-filter=76mm
L-flange=16mm
L-total=92mm