A teat cup comprises a flexible liner (3) for engaging about a teat of an animal to be milked, the liner having a head portion (7), at one end (6), provided with a mouth (9) through which the teat is engageable with the liner, and a milk discharge passageway (12) at the opposite end (5). A nozzle (24) is arranged to discharge fluid into the head portion of the liner, and a fluid delivery tube (21) is connected to the nozzle via a check valve (17) which allows fluid delivery to the nozzle and alleviates the risk of dirt or disinfectant lodging in the nozzle or delivery tube when the teat cup is treated on a jetter at the finish of a milking period.