Control stop cap friction ring

A control stop for use in a plumbing supply line including a body, an inlet and outlet in said body, a valve seat in said body and a valve member movable toward and away from said valve seat to control flow from said inlet to said outlet, an opening in said body providing exterior access to said valve member for adjustment thereof, the improvement comprising a cap assembly for said opening, said cap assembly including a cap having means thereon to rotatably attach the cap to said body about said opening, said cap having an interior surface which faces said body, an elastomeric friction ring positioned between said cap interior surface and said body, said friction ring having a plurality of circumferentially spaced projections facing and in contact with said body, which projections are formed and adapted to require less torque when said cap is rotatably attached to said body than when said cap is rotatably removed from said body.