Adjustable additive injection unit for a marine toilet system

An arrangement for introducing an additive into a fluid flow which comprises, in combination,

• a flow pipe formed from corrosion resistant plastic having a uniform diameter,
• means for connecting said flow pipe in series fluid-flow with a conduit, said means for connecting said flow pipe being formed from corrosion resistant plastic,
• a closed additive reservoir cavity formed by a main body section of said arrangement surrounding said flow pipe, said means for connecting said flow pipe in series flow relation, and a twist-on sealing cap covering an access passageway, said additive reservoir cavity comprising, in combination, a sanitary pipe tee joint having first and second circular mouths at opposing ends of a cylindrical transverse body pipe section and a third circular mouth at the outer end of a branch pipe section which extends radially outward from the middle of said transverse body pipe section, first and second annular size-reduction bushings inserted in and affixed to the said first and second mouths respectively for removably securing opposing ends of said flow pipe in a position extending axially through said transverse body pipe section,
• at least one inlet aperture and at least one return aperture through said flow pipe, both of said apertures providing a fluid flow path between the interior of said pipe and said additive reservoir cavity, and said inlet aperture being positioned upstream from said return aperture to induce a portion of the fluid flowing through said conduit to flow through said additive reservoir cavity,
• said access passageway leading into said additive reservoir cavity and being normally covered by said removable twist-on sealing cap which may be opened to permit an additive material to be introduced into said additive reservoir cavity and thereafter closed to provide a pressure tight seal for said additive reservoir cavity and to retain said material within said additive reservoir cavity, and
• a pair of mounting yokes mounted for rotational movement to each end of said transverse body pipe section, each of said mounting yokes defining mounting feet having a bearing surface for individual engagement with and attachment to an available base structure, and
• a resilient O-ring positioned between each of the mounting yokes and said transverse body pipe section for providing a friction fit between said mounting yokes and said body pipe section which permits said mounting yokes to rotate and move axially with respect to said body pipe section while securing said body pipe section in place with respect to said mounting yokes.