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Yamaha A0141189 Trumpet Water Key Corks 2-Pack — main product image
Yamaha

Yamaha A0141189 Trumpet Water Key Corks 2-Pack

Keep your water keys sealing cleanly every performance — Yamaha's 9mm cork pads restore airtight spit valve function on trumpets, cornets, and tubas.

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Overview

The Yamaha A0141189 Water Key Cork set addresses one of the most common maintenance needs in brass playing — a spit valve that no longer seals cleanly. When a water key cork wears down, dries out, or cracks, the result is an air leak at the spit valve that compromises the instrument's intonation and response, and the fix is a straightforward cork replacement. These pads are spec'd at 9mm diameter and 3.5mm thickness, matching the standard water key cup dimensions found on Yamaha trumpets, cornets, baritone horns, and tubas, as well as many other manufacturers' instruments. For band directors, repair technicians, and self-sufficient players maintaining their own gear, having these on hand means a leaking water key gets fixed the same day rather than waiting for a repair appointment.

Each set contains two cork pads, giving you a replacement and a spare. Yamaha guarantees at least one smooth, usable surface per pad — an honest acknowledgment that natural cork material varies in appearance and texture, but the functional sealing surface is quality-controlled. Installation is straightforward with contact cement or instrument-grade adhesive; the key is proper surface preparation and allowing full cure time before playing to ensure a lasting seal. At 3.5mm thickness, these pads provide the correct compression depth for standard water key cup geometry — critical for achieving the airtight seal that keeps the instrument responding predictably through every register.

Key Features

Yamaha Water Key Cork Pad

Trumpet Cornet Baritone Tuba

9 mm diameter x 3.5 mm thickness Will Fit Many Other Brands

Set of 2

Due to the nature of the material the actual look might differ from the picture. We guarantee that at least one side of the pad has a smooth usable surface

Specifications

Diameter
9 mm
Thickness
3.5 mm
Material
Cork
Quantity
Set of 2
Compatibility
Yamaha Trumpet, Cornet, Baritone, Tuba; many other brands
Application
Water key (spit valve) replacement

Frequently Asked Questions

They're sized and specified for Yamaha trumpets, cornets, baritone horns, and tubas. At 9mm diameter and 3.5mm thickness, they also fit many other brands' water keys — it's a common standard size across brass instruments.
When a water key no longer seals fully when pressed — causing air leaks that affect intonation and response — or when the cork is visibly compressed, cracked, dried, or crumbling, it's time to replace it. A leaking spit valve is the most immediate sign.
Most players with basic repair experience can replace a water key cork using contact cement or instrument repair adhesive. A repair technician is recommended for players without repair experience, particularly on higher-value instruments where improper installation could cause damage to the key mechanism.
Yes — the 3.5mm thickness is spec'd to create the correct compression and contact with the water key cup. Using a cork that's too thin won't seal; too thick and the key won't close fully. These are dimensioned specifically for standard water key cup depths.
Two. For a standard trumpet with one main water key, that gives you an immediate replacement and a spare. For instruments with multiple water keys — some tubas and larger brass — plan your order count accordingly.

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