B2GOF!!! Ultra Glide Tuning Slide Grease Synthetic Grease with P.T.F.E. 
Slide-O-Mix Rapid Comfort. Lubricant for Trombone Slide 
Waterkey Tip Cover. Fits Most Waterkeys on Brass Instruments Pack of 2
£2.53
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A black rubber sleeve that slots onto the end of most waterkeys on brass instruments. It helps protecy the bow of the instrument from scratches or dents and also silences the annoying click of metal on metal when emptying water.
If a little tight – warm them up in hot water to help fit them into place
