A check valve assembly comprises: a housing extending axially along a center axis of the check valve assembly from a first end to a second end, wherein the housing comprises: an opening disposed at the first end; an outlet disposed at the second end; an inner surface extending from the first end toward the second end of the housing, wherein the inner surface comprises a tapered portion; and an annular locking groove formed on the tapered portion of the inner surface; a seat disposed in the opening and connected to the housing, wherein the seat comprises: an inlet extending axially through the seat; an outer surface contacting the inner surface of the housing, the outer surface tapering radially inward from a first side of the seat to a second side of the seat to aid insertion of valve seat into opening of housing during assembly of check valve assembly; and an annular locking ridge formed on the outer surface of the seat and extending into the annular locking groove of the housing to connect the seat to the housing in a snap fit connection; a ball disposed inside the housing and disposed axially between the seat and the outlet, wherein the ball is larger in diameter than the inlet; a ball guide disposed inside the housing and disposed axially between the ball and the outlet; and a spring disposed inside the housing and disposed axially between the ball guide and the outlet, wherein the spring is compressed between the ball guide and the outlet, wherein the housing is tubular and comprises a substantially uniform outer diameter from the first end to the second end of the tubular housing, and wherein the tapered portion of the inner surface tapers radially inward from the first end of the housing to second side of the valve seat so that the tapered portion inner surface corresponds with the outer surface of the seat. a housing extending axially along a center axis of the check valve assembly from a first end to a second end, wherein the housing comprises: an opening disposed at the first end; an outlet disposed at the second end; an inner surface extending from the first end toward the second end of the housing, wherein the inner surface comprises a tapered portion; and an annular locking groove formed on the tapered portion of the inner surface; an opening disposed at the first end; an outlet disposed at the second end; an inner surface extending from the first end toward the second end of the housing, wherein the inner surface comprises a tapered portion; and an annular locking groove formed on the tapered portion of the inner surface; a seat disposed in the opening and connected to the housing, wherein the seat comprises: an inlet extending axially through the seat; an outer surface contacting the inner surface of the housing, the outer surface tapering radially inward from a first side of the seat to a second side of the seat to aid insertion of valve seat into opening of housing during assembly of check valve assembly; and an annular locking ridge formed on the outer surface of the seat and extending into the annular locking groove of the housing to connect the seat to the housing in a snap fit connection; an inlet extending axially through the seat; an outer surface contacting the inner surface of the housing, the outer surface tapering radially inward from a first side of the seat to a second side of the seat to aid insertion of valve seat into opening of housing during assembly of check valve assembly; and an annular locking ridge formed on the outer surface of the seat and extending into the annular locking groove of the housing to connect the seat to the housing in a snap fit connection; a ball disposed inside the housing and disposed axially between the seat and the outlet, wherein the ball is larger in diameter than the inlet; a ball guide disposed inside the housing and disposed axially between the ball and the outlet; and a spring disposed inside the housing and disposed axially between the ball guide and the outlet, wherein the spring is compressed between the ball guide and the outlet, wherein the housing is tubular and comprises a substantially uniform outer diameter from the first end to the second end of the tubular housing, and wherein the tapered portion of the inner surface tapers radially inward from the first end of the housing to second side of the valve seat so that the tapered portion inner surface corresponds with the outer surface of the seat.