Patent ID: 7131450

Claim:
An apparatus for washing a sample tube comprising: a holder holding a sample tube having a closed end at one end and an open end at the other end so that the open end of said sample tube is directed downward; a suction tube having an upper end inserted into said sample tube and a lower end supported by said holder; a receiving tube installed around said sample tube and having a flange portion at a lower end; a siphon tube having an engaging shoulder portion, said shoulder portion engaging the holder on an inner periphery at an upper end; an O-ring installed between the flange portion of the receiving tube and the holder; and thread-connecting upper and lower connectors pressing vertically the flange portion of the receiving tube and the siphon tube to press the O-ring between the receiving tube and the holder; wherein a circulation pass, in which a fluid provided from above flows to an opening of the upper end of the suction tube, is formed between the sample tube and the receiving tube and between the sample tube and the suction tube; and wherein the holder, the receiving tube, the suction tube, the siphon tube, and the sample tube are separable when the upper and lower connectors are disengaged.