An oral irrigator system comprising: an irrigator tip, the irrigator tip comprising: a nozzle comprising a first channel; a handle comprising a second channel in fluid communication with the first channel; a tether having a first end and a second end, a third channel arranged between the first end and the second end, the first end of the tether in fluid communication with the second channel; a reservoir containing a fluid, the reservoir in fluid communication with a pump, the pump in fluid communication with the third channel and the second end of the tether; and an arrowhead check valve comprising a resilient element and an elastic head element, the arrowhead check valve arranged within the third channel, wherein the elastic head element comprises: an elongated portion having a first end and a second end; a frustoconical portion integrally connected to the elongated portion; and, a circular lip or a plurality of tabs integrally connected to the elongated portion, wherein the frustoconical portion of the elastic head element comprises a frustoconical surface arranged to contact and deform when in contact with an inner surface of the third channel, and wherein the circular lip or the plurality of tabs of the elastic head element comprise one or more surfaces (168, 172) facing the first end of the elongated portion, the one or more surfaces arranged to contact and deform when in contact with the resilient element. an irrigator tip, the irrigator tip comprising: a nozzle comprising a first channel; a handle comprising a second channel in fluid communication with the first channel; a nozzle comprising a first channel; a handle comprising a second channel in fluid communication with the first channel; a tether having a first end and a second end, a third channel arranged between the first end and the second end, the first end of the tether in fluid communication with the second channel; a reservoir containing a fluid, the reservoir in fluid communication with a pump, the pump in fluid communication with the third channel and the second end of the tether; and an arrowhead check valve comprising a resilient element and an elastic head element, the arrowhead check valve arranged within the third channel, wherein the elastic head element comprises: an elongated portion having a first end and a second end; a frustoconical portion integrally connected to the elongated portion; and, a circular lip or a plurality of tabs integrally connected to the elongated portion, wherein the frustoconical portion of the elastic head element comprises a frustoconical surface arranged to contact and deform when in contact with an inner surface of the third channel, and wherein the circular lip or the plurality of tabs of the elastic head element comprise one or more surfaces (168, 172) facing the first end of the elongated portion, the one or more surfaces arranged to contact and deform when in contact with the resilient element. an elongated portion having a first end and a second end; a frustoconical portion integrally connected to the elongated portion; and, a circular lip or a plurality of tabs integrally connected to the elongated portion, wherein the frustoconical portion of the elastic head element comprises a frustoconical surface arranged to contact and deform when in contact with an inner surface of the third channel, and wherein the circular lip or the plurality of tabs of the elastic head element comprise one or more surfaces (168, 172) facing the first end of the elongated portion, the one or more surfaces arranged to contact and deform when in contact with the resilient element.