Patent ID: 7828053

Claim:
A multipart frac head, comprising: a frac head body having a plurality of inlet ports received in respective side entries in the frac head body and welded to the respective side entries and a bottom leg socket in a bottom end of the frac head body, the bottom leg socket comprising a box thread and a seal bore located above the box thread; and, a bottom leg removably secured in the bottom leg socket, the bottom leg comprising an inner end having an elongated pin thread that cooperates with the box thread in the bottom leg socket to secure the bottom leg in the bottom leg socket, the elongated pin thread extending beyond the bottom leg socket when the bottom leg is secured in the bottom leg socket and is engaged by a box thread of a lock nut that is tightened against the bottom end of the frac head body to lock the bottom leg in the bottom leg socket, and an outer end that includes an external shoulder with an upper side that supports a threaded union nut and an underside with a metal ring gasket groove.