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 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 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 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 . <EOS>