The mark consists of a three-dimensional configuration of a fuel pressure regulator. The regulator has a two-step cylindrical cap with a beveled upon circumferential edge and a beveled interface between the two steps of the cylinder. The stepped-cylindrical cap includes a mounting flange projecting outward from a lower end thereof for mounting the cap to a base. An upper portion of the sidewalls of the base are bowed outward relative to the ends to form a hexagonal upper section of the base. Sidewalls of a lower portion of the base are recessed inward from the outwardly bowed portions such that the lower portion of the base is generally rectangular. The mounting flange is generally hexagonal and matches the peripheral geometry of the upper portion of the base to which it is mounted. The cap is secured to the base with screws whose heads extend above the mounting flange. The corners of both the mounting flange and the base are rounded. A hose mounting nipple extends outward from the lower step of the cap in alignment with an axis extending lengthwise through the base. A relatively large diameter threaded port is formed in each end of the base and a smaller port is formed in the upper bowed portion of one of the sidewalls of the base.