If you are not in the mood for large oversized trombone valves, then you must have the ROTAX Full-Flow valve installed. The ROTAX valve fits into every trombone! It is the preferred valve for many instrument manufacturers. We supply individual valves but also complete kits. Following bore sizes are available: 14,2mm/15,0mm/15,2mm. Contact us for specialty orders and delivery time!  Please send mail to:  office@willson.ch