16 in the preferred embodiment the conduit has an inner diameter of 0 260 0 290 inches and a maximum outer diameter of 0 375 inches inner channels 18 are sized lengthwise to extend several inches beyond the forward end of hose 16 five inches in the preferred embodiment to form forward articulating end 20 front guide fitting 22 at the forward end of hose 16 and tip guide fitting 24 serve to hold channels 18 in their relative positions to each other as they extend beyond hose 16 front guide fitting 22 and tip guide fitting 24 may be secured to channels 18 by any suitable means such as soldering compression spring 26 is received between front guide fitting 22 and tip guide fitting 24 and may be secured in position by welding to each piece to prevent slippage during articulation of end 20 two springs 26 are used in the preferred embodiment however this depends upon the length of end 20 and conditions expected to be encountered compression spring 26 serves as a means for biasing end 20 to a normally straight position when there are no forces generated to cause articulation thereof means 14 for causing articulation of end 20 is.