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An internal check ball retainer for use in an in line check valve assembly has a M-shape configuration with a rectangular cross section. The in line check valve assembly includes a check valve having a check ball hole connected to a smaller through hole by a ball seat. A check ball is positioned in

An internal check ball retainer for use in an in line check valve assembly has a M-shape configuration with a rectangular cross section. The in line check valve assembly includes a check valve having a check ball hole connected to a smaller through hole by a ball seat. A check ball is positioned in the check ball hole and is movable against the ball seat to block the through hole. The internal check ball retainer is dispositioned so as to dispose the check ball between the parallel arms of the M-shaped configuration and abuttable with the vertex of the V-shaped portion of the internal check ball retainer. A connector having a through-hole provided therein is threaded into the check ball hole so as to abut the internal check ball retainer and hold it in place while the V-shaped portion of the M prevents the check ball from blocking the through-hole in the connector.

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In a check valve assembly having a check valve with a check ball hole provided therein connected by a ball seat to a through-hole further provided therein, a connector with a through-hole provided therein engageable with the check valve, and a check ball positioned in the check valve movable to abut

In a check valve assembly having a check valve with a check ball hole provided therein connected by a ball seat to a through-hole further provided therein, a connector with a through-hole provided therein engageable with the check valve, and a check ball positioned in the check valve movable to abut the ball seat and block the through-hole in the check valve, the improvement comprising: an internal check ball retainer formed from a flat strip having bends along its length in three locations to define a generally M-shaped configuration with a pair of parallel portions connected by a generally V-shaped portion, said internal check ball retainer being insertable in the check ball hole of the check valve so as to dispose the check ball between the parallel portions with the V-shaped portion proximate the connector.