ring 316 and as discussed above the tenons 306 interlock with the mortises 304 to laterally secure the gooseneck conduit assembly 154 b the locking member 408 extends from the gooseneck conduit assembly 154 b into the locking channel 406 to prevent movement of the gooseneck conduit assembly 154 b upward along the telescoping joint 130 fig5 shows a perspective view of the support collar 150 and the gooseneck conduit assemblies 154 as arranged in fig4 fig6 shows a cross sectional view of the support collar 150 and gooseneck conduit assemblies 154 as arranged in fig4 embodiments of the gooseneck conduits assemblies 154 may include any combination of hydraulic and mechanical primary and secondary locks the gooseneck conduit assembly 154 b includes a hydraulic primary lock 618 and a hydraulic secondary lock 308 the components of the hydraulic primary lock 618 are disposed between the upper and lower support plates 302 and 404 the hydraulic primary lock 618 includes a hydraulic cylinder 612 coupled to the locking member 408 for extension and retraction of the locking member 408 the components of the hydraulic secondary lock 308 are secured to the upper plate 302 by hydraulic cylinder support plate 606 the hydraulic secondary lock 308 includes a hydraulic cylinder 602 coupled to a locking pin 604 for extension and retraction of the locking pin 604 when the locking member 408 has been extended extension of the locking pin 604 secures the locking member 408 in the extended position in some embodiments the locking member 408 includes a passage 608 the locking pin.