Product has 8x32 thread Fits following models: 14KSP Conn Sousaphone, * 14K Conn Sousaphone, * 22K Conn Sousaphone, * 20KSB Conn Sousaphone, * 20KSP Conn Sousaphone, * 20K Conn Sousaphone, * 7T Benge Triumphal Trumpet, * 2370 King Sousaphone, * 1141 King Marching Tuba 2350SP King Sousaphone, * 4PSP & 4P Benge Piccolo Trumpet, * 1FR & 1FRSP Conn Flugelhorn, * 2350SB King Sousaphone, * 2360 King Sousaphone, * 2370SP King Sousaphone, * 36K Conn Sousaphone, * B1111S King Sousaphone, * 89H Conn Tenor Trombon, * B1111 King Sousaphone, * 2020 & 2020SP King Flugelhorn, * 1141SP King Marching Tuba 2360SP King Sousaphone, * 1529 King Sousaphone, * 36KSP Conn Sousaphone, * 2350 King Sousaphone