Abstract: A fluid flow control valve comprising a substantially cylinder-shaped body for insertion in a tube or pipe, said body having an annular recess therearound for the reception of a resilient O-ring to effect a seal between said body and the inner surface of said tube or pipe, one end of said body having a rectangular recess thereacross and a reed athwart said rectangular recess, said body having an orifice therethrough, one end of which opens into said rectangular recess, said reed having an opening therethrough to pass a threaded member, said member having a head thereon for engaging said reed and holding it firmly against said body.