"Disc Top" caps are opened by pressing on one side of the top disc.
Ref.
TAPRES20/410
TAPRES20/415
TAPRES24/410
TAPRES24/415
TAPRES28/410
TAPRES28/415
Necks
20/410
20/415
24/410
24/415
28/410
28/415
Ref. TAPRES24/410OY
Neck: 24/410