Hetman Classic Piston Lubricant 3 is valve oil for piston valves with greater-than-average clearance
All Hetman Musical Instrument Lubricants offer superior lubricating qualities, are longer-lasting than other lubricants, and are completely compatible with conventional petroleum-based lubricants, thereby avoiding potential gumming problems. The viscosity of each lubricant is carefully formulated for its specific purpose and assures both fast, positive action and vital protection against wear and corrosion.
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Comments about Hetman Classic Piston Lubricant 3:
This oil has provided good results on my 35 year old trumpet. When using oils designed for new horns (like Al Cass), the valves would not return well. I tried Alisyn and it worked well but stained the valves (the valves got a brass colored coating). Hetman Classic provides good action but doesn't stain the valves.