Abstract: A plug retainer and receiving flange for a mud pump fluid module pipe comprising a plug retainer and a receiving flange. The threads of the plug retainer are configured into at least two segments that are axially disposed opposite each other upon the periphery of the plug retainer. Each segment of plug retainer threads has at least two columns of threads that are progressively stepped outward from said the periphery of said plug retainer. The receiving flange has at least two segments of flange threads axially disposed upon the periphery of the flange bore that are disposed opposite each other on the flange bore to form gaps between each of the thread segments, each segment of receiving flange threads has at least two columns of threads that are progressively stepped inward and are configured to correspond with the plug retainer thread segments. A means to rotate the plug retainer within the bore of the receiving flange is provided to engage the plug retainer threads with the receiving flange threads.