threads 18 the inner periphery of the bore 14 is relieved to provide a seat for gasket 19 the body thus formed is preferably fabricated from die cast aluminum and has a diameter of approximately 6 974 inches and an overall height of about 5 5 inches excluding the boss 17 to the body thus formed there is attached a fuel sedimentation or expansion bowl designated generally by the numeral 21 and including a preferably transparent bowl 22 fabricated from an appropriate synthetic resinuous material so as to provide an open upper end 23 and a closed bottom end 24 through which is formed a drain aperture 26 normally kept sealed by an appropriate plug 27 the upper open end 23 of the transparent bowl is provided with a radially outwardly extending flange 28 adapted to be caught by a clamp ring 29 secured to the bottom wall 6 of the body member by appropriate screws 31 to seal the union between the open upper edge of the transparent bowl and the bottom surface 32 of the bottom wall 6 the bottom wall is formed with an annular groove 33 within which is trapped a seal ring 34 which lies disposed between the bottom wall 6 and the upper edge of the bowl 22 the union between these two members is thus sealed fluid.