Detail 01
Alto saxophone fit
Cut for the alto body socket. A tenor or soprano plug is a different diameter and won't seat right.

Independent shopping perspective
The plug that fills the neck socket of an alto sax while it's in the case, keeping the octave key linkage from getting pressed. A replacement part.

Strong match
Consider the trade-offs
What matters in use
Catalog numbers tell only part of the story. These are the details most likely to change how this product feels, sounds, or fits into a setup.
Detail 01
Cut for the alto body socket. A tenor or soprano plug is a different diameter and won't seat right.
Detail 02
It occupies the socket the neck normally fills, holding the octave key mechanism clear while the horn is packed.
Detail 03
Made to Yamaha's alto socket, so the fit is meant to be snug rather than rattling loose.
Detail 04
Cheap enough to keep a spare in the case pocket. Losing one shouldn't put the octave key at risk.
Final check
Product questions
Straight answers to the questions shoppers most often ask about this product.
It sits in the socket where the neck normally goes. With it in place, the octave key lever can't be pressed or bent while the body is in the case.
No. It's sized for the alto body socket. Tenor and soprano sockets are different diameters, and a loose plug defeats the purpose.
It's made to Yamaha's alto socket. Many altos are close, but fit isn't guaranteed across brands — check that it seats snugly before trusting it.
Only if the plug is missing. Cases come with one. This is a replacement.