110 engage the top sub 4 of an inline swivel brass packing rings 27 and washpipe packing 26 seal swivel mandrel 5 permitting fluid communication through the annulus of the inline swivel apparatus without leakage swivel mandrel 5 is secured to the circumferentially spaced brass wear ring 31 bearing 29 packing 28 and 30 by a bearing retainer nut 6 which is threadably engaged on the top sub 4 by threads 33 and 33 u2032 as shown in fig2 the wear ring 31 has seal means 36 37 which contact the bearing retainer nut 6 the lower body 3 is threadably engaged into the top sub 4 of the inline swivel the swivel mandrel 5 of the inline swivel is provided with inner splines 21 to engage the outer splines 18 formed on the lower end of the locking mandrel 2 which extends through the lower body 3 and top sub 4 hydraulic fitting ports 40 and 41 provided in the lower body 3 are disposed on either side of a dynamic seal means 17 in a chamber formed between exterior of the locking mandrel 2 and the interior wall 43 of the lower body 3 to move the locking mandrel 2 either up or down and thereby into or out of engagement with the splines 21 on the swivel mandrel 5 and the splines 20 in the lower body 3 the locking mandrel 2 moves up or down as provided and is stopped by shoulder 15 from moving into retainer sub 1 washpipe packer or seal means 45 and 46 are provided to make a hydraulic.