Pneumatic Check Valves

[2010FRC1086]

This part attaches to a cylinder port and allows air to freely exhaust in one direction, while also allowing pressure to flow into the cylinder from the other direction. The part uses a pneumatic check valve to accomplish this.
It is available off the shelf, has 1/8" NPT fittings and meets pressure requirements. Does this fall into the same category as flow controls, which have been ruled a legal part under <R72-F>? Is it otherwise legal to use this part?

[2010FRC3125]

Are pneumatic check valves legal this season?

[GDC]

Check valves, or parts that contain check valves, are not explicitly identified as permitted parts in Rule <R72>. Therefore, under Rule <R71> they are prohibited.