therein the grip with its port 114 is designed to intermittently engage with a needle valve structure 120 connected via a tube 122 to an off carriage ink reservoir such as one of the reservoirs 80 86 of the system of fig1 fig7 shows the valve structure 120 adjacent but not engaged with the port 116 fig8 shows the valve structure 120 fully engaged with the port as shown in fig8 the structure 120 includes hollow needle 122 with a closed distal end but with a plurality of openings 124 formed therein adjacent the end a sliding valve collar 128 tightly fits about the needle and is biased by a spring 126 to a valve closed position shown in fig7 when the structure 120 is forced against the port 116 the collar is pressed up the length of the needle allowing the needle tip to slide into the port opening 118 as shown in fig8 in this position ink can flow through the needle openings 124 between the reservoir 104 and the tube 130 thus with the cartridge 100 connected to an off carriage reservoir via a valve structure such as 120 a fluid path is established between the print cartridge and the off carriage reservoir ink can flow between the off carriage ink reservoir to the cartridge reservoir 104 when the structure 120 is pulled away from the handle 108 the valve structure 120 automatically closes as a result of the spring 126 acting on the collar 128 the opening 118 will close as well due to the elasticity of the material 116 thereby providing a self sealing refill port for the print cartridge fig6 8 illustrate a locking structure 172 for releasably locking the valve 120 into the refill arm 170 at.