This is an everflow supplies p-trap for use in suction lines with vertical risers, in applications where, for example, flow from compressors needs to be assured. In particular, the p-trap has a sloped line to ensure that the liquid, in many cases oil, accumulates in the trap, such that a pool is available for suction into the riser. Furthermore, this fitting has on both ends solder cups with a nominal size of 5/8 inch, for use with copper pipe with a diameter of 3/4 inch.