versa when first portion 51 and second portion 52 are brought together and closed a first central opening 63 provided in first portion 51 will become in mating or opposed contact with second central opening 64 providing a central opening 66 which may be used to hang the tubing device on a bag hook 34 fig1 or the like two part tubing device 50 has proved particularly useful in biological fluid filtration or dispensing systems it especially is useful in such biological fluid filtration or gravitational dispensing systems where a loop or elevated portion is used for automating and increasing recovery from a gravitational dispensing of fluid fig1 illustrates such a system which is disclosed in united states letters pat no 6 171 493 biological fluid filtration system 70 has a blood container or bag 71 provided upstream from and elevated above a leukocyte depletion device 72 the leukocyte depletion device 72 has an inlet 73 and an outlet 74 separated by a filter media 75 blood container 71 is connected to or in fluid communication with said leukocyte depletion device 72 through first conduit 76 there is also provided a blood receiving container 78 downstream of the leukocyte depletion device 72 leukocyte depletion device 72 is connected to blood receiving container 78 through second conduit 79 an inlet clamp 81 and an outlet clamp 82 may be provided a bypass line 91 is provided which may be in fluid communication with the blood container 71 and blood receiving container 78 bypass clamp 84 may be provided in bypass line 91 in order for the closed loop.