Yamaha Valve Cap Felt Washer – Trumpet/Cornet – VJA17500

The Yamaha VJA17500 Valve Cap Felt is a genuine Yamaha replacement felt washer that sits between the valve cap and the top of the piston on brass instruments. It cushions the action, keeps the valve stroke quiet, and helps the piston stop at the correct height. This is an OEM Yamaha part, not an aftermarket copy. 

These felts are commonly used on Yamaha piston brass such as Bb trumpet, cornet, and related Yamaha jazz brass models, and are also widely used by repair techs when servicing flugelhorn and alto horn. Fit can vary by instrument model and production era, so Yamaha advises checking your instrument model number before ordering. 

If the original felt is flattened, missing, or soaked in oil, you’ll start to hear metal-on-metal clicking and the valve may feel loose at the top of its travel. Replacing the felt restores a smooth, quiet piston feel and more consistent valve alignment. Brass players (and school band repairs) treat these as routine service parts for keeping the horn tight and responsive. 

Key Features

• Genuine Yamaha part
  Supplied as an original Yamaha component, matching factory tolerances. Using OEM felts helps preserve the instrument’s intended valve height, feel, and response. 

• Quiet piston action
  The felt sits between the valve cap and the piston to absorb impact and stop the “click” you get when the valve reaches the top of its stroke. This keeps the horn quieter under fast passages and section work. 

• Maintains correct alignment
  A fresh felt also helps centre the piston at the right height so the ports line up cleanly, which supports clean airflow and reliable slotting. Players notice this as a smoother, more confident valve feel. 

• Compatible with common Yamaha piston brass
  Yamaha valve cap felts are used across Yamaha trumpet, cornet, flugelhorn, and alto horn lines, especially in Yamaha “jazz” / band instruments, and often cross-fit with popular pro horns (Bach, Schilke, etc.). Always confirm your exact model first, as Yamaha supplies multiple felt part numbers. 

• Simple preventative maintenance
  Replacing worn felts, guides, and springs at the same time (common workshop practice) restores fast, quiet valve action without needing a full overhaul. Yamaha service kits often pair felts with springs, guides, and water key corks for that reason. 

Why Choose This Part

Small consumables like felts take constant impact every time the valve returns. Over time they compress, get oily, or crumble — which is when valves start clicking and feeling sloppy.

Dropping in a fresh Yamaha VJA17500 felt is a quick, inexpensive way to:

• Get rid of top-end rattle and click.

• Bring the piston stop point back to where Yamaha designed it.

• Keep section playing tidy (especially in brass band, concert band, and jazz settings where valve noise is picked up by close mics). 

Ev-Entz Music is an independent, family-run brass and woodwind specialist. If you’re not sure which Yamaha felt fits your specific trumpet, cornet, flugelhorn, or alto horn, advice is available before you order.

Specifications

• Part name: Valve Cap Felt / Valve Cap Felt Washer

• Manufacturer: Yamaha (Yamaha Music Europe GmbH) 

• Manufacturer / Yamaha Part Code: VJA17500

• Function: Sits between the valve cap and piston to dampen mechanical noise and set correct piston height. 

• Instrument family: Yamaha piston brass (commonly trumpet, cornet, flugelhorn, alto horn; usage depends on model) 

• Typical Yamaha top-cap felt dimensions: approx. 14 mm outer diameter, 6 mm centre bore, ~3 mm thick on standard Yamaha trumpet/cornet top-cap felts, usually supplied in sets of three. Actual spec can vary by instrument model, so confirm fit before ordering. 

• Colour: Usually black or natural felt depending on model batch. Yamaha supplies these as individual service parts. 

• Sold as: Individual felt washer (single piece), not a full kit.