How to bleed air from hydraulic clutch The seller is dieselautopower and is located in this country US. Valair heavy duty adjustable hydraulic master / slave replacement nmu70hyd-01 for questions or help please call 8oi-6l8-2l51. The Valair Heavy Duty Replacement Hydraulics NMU70HYD-01 is a heavy duty hydraulic upgrade perfect for use with a stock replacement or upgraded clutch.