i e a trapezoids dove tails etc the channel mortises 304 may narrow with proximity to the support collar 150 with proximity to the bottom of the alignment ring 316 similarly the tenons 306 may narrow with distance from the top plate 302 with proximity to the bottom of the rear face 318 of the gooseneck conduit 156 the tenons 306 and mortises 304 are dimensioned to securely interlock the gooseneck conduit assembly 154 includes locking mechanisms that secure the gooseneck conduit assembly 154 to the telescoping joint 130 embodiments may include one or more locking mechanisms that are mechanically or hydraulically actuated for example embodiments may include a primary and a secondary locking mechanism hydraulic secondary backup locks 308 are included on some embodiments of the gooseneck conduit assembly 154 the hydraulic secondary locks include a hydraulic cylinder that operates the lock other embodiments include mechanical secondary backup locks 310 in some embodiments the secondary backup locks secure the primary locking mechanisms into position lock state indicators 314 show the state of conduit assembly locks for example extended indicators 314 indicate a locked state and retracted indicators 314 indicate an unlocked state fig4 shows an elevation view of the support collar 150 and gooseneck conduit assemblies 154 in accordance with various embodiments the gooseneck conduit assembly 154 a includes two gooseneck conduits 156 and is unlocked and separated from the telescoping joint 130.