Abstract: An oral irrigator that is configured to be connected to a tap, such as a shower tap, is described. In one embodiment, an oral irrigator has a tap manifold for coupling the irrigator between the shower tap and a showerhead. The oral irrigator has an antiseptic port for the introduction of antiseptic into the flow of water from the irrigator tip. In an exemplary embodiment, an irrigator regulator is configured at the irrigator end of a conduit, whereby a user can manipulate an irrigator control feature to control the amount of flow to the irrigator tip. In still another embodiment, an irrigator regulator comprises an antiseptic port and manipulation of an irrigator valve may direct a flow of water to the antiseptic port, thereby introducing a flow of antiseptic out of the irrigator tip.