Whistle-cap device

A whistle cap device and a container having a head with an opening therein to said container and fastening means associated with said head, said whistle-cap device comprising:

• a body having a top wall, bottom and sides and an end;
• said body having space located in said body;
• means for permitting the operation of said whistle-cap device only when said device is unfastened from the container, said operating means including a hollow passage extending from said space to said end to form an opening in said device which extends from said end to said space, said passage being located contiguous to said top wall;
• said top wall having an opening therein extending through said top wall to said passage;
• and,
• fastening means adapted to be fastened to said container, said fastening means being located adjacent said passage opening in said end;
• said body fastening means being removably fastened to said container fastening means, whereby said device end will be positioned contiguous to said container head and said whistle-cap device will be inoperable as a whistle because of the inaccessibility of said passage opening but will be operable when said container is removed from said cap device.