A holder system comprises a holder (1), provided with a seal (2) and an external circumferential band (3). A slip ring (4) is provided which can be pressed against the seal (2) in the direction shown by the arrows (5) provided on the slip ring to form a snap fit with the holder. Above the holder is a collar (6) designed to engage with the upper surface (7) of the holder. FIG. 2 shows a teat (8) provided with a band (9) at its lower end which engages with a lug inside the holder (1) to provide a tight seal, the cap (10) is placeable in the collar. The attachment of the collar (6) to the holder (1) secures the teat in position.
