A fluid delivery system for delivering a fluid from an automatic water source to animals housed in cages in high density caging systems may comprise a flexible, non-metal, hose-type manifold line having a plurality of circular apertures and a plurality of injection molded plastic saddle fittings each configured to fit into an aperture. Each cage location may comprise two apertures opposite one other and two saddle fittings fit thereto. The saddle fittings may further comprise a U-shaped portion configured to fit around the flexible manifold line, an inward-facing protrusion sized and configured to penetrate and seal to an aperture, and one or more ribs to seal the aperture and/or grip the flexible manifold.