kinking the ends of the line are housed in metal conduits 28 a 28 b connected by pressure tight joints to the male parts 16 a 16 b the line ends 24 a 24 b exit the conduits 28 a 28 b through suitable pressure tight glands not shown thereby maintaining the pressure integrity of the well as shown in mare detail in fig2 4 the female parts 18 a 18 b and the inner ends of the male parts 16 a 16 b are adapted to form double poppet valve assemblies 30 a 30 b respectively the female parts each comprise a valve housing 31 and the male parts a corresponding housing 34 poppets 32 having short noses 38 are slidable in the housings 31 and poppets 40 having longer noses 42 are slidable in the housings 34 against the action of respective bias springs 44 the poppets 32 40 each have an axial bore 46 with a plug 47 containing a smoothly joined series of drillings 49 juxtaposed to an oblique radial bore 48 in the poppets 32 40 the housings 31 34 each have an oblique radial born 50 a series of intercommunicating drillings 52 54 56 58 are provided in the tubing hanger and tree the drillings 52 56 have.