Tamper Proof Boat Drain Plug

Abstract

A boat plug has external threads that mate with a boat hole housing, and an end keyed to operate the plug. In preferred embodiments the key has a first end portion that mates with the plug, and a second end portion that mates with a driver. The first end portion, and the corresponding recess in the plug, can advantageously have depths of no more than 1 cm, and more preferably no more than 5 mm. In other aspects of preferred embodiments, the first end portion comprises a recess having irregularities, and independently the second end portion comprises a nut.

1 . A plug system for a boat having a housing that defines a drain hole, comprising:
 a plug having external threads that mate with the housing, and an end having a first keyed portion; and   a key having (a) a second keyed portion that mates with the first keyed portion, and (b) a driving portion.   
     
     
         2 . The plug system of  claim 1  wherein the first keyed portion has a depth of no more than 1 cm. 
     
     
         3 . The plug system of  claim 1  wherein the first keyed portion has a depth of no more than 5 mm. 
     
     
         4 . The plug system of  claim 1  wherein the first keyed portion comprises a recess. 
     
     
         5 . The plug system of  claim 1  wherein the driving portion comprises a nut. 
     
     
         4 . The plug system of  claim 1  wherein the first keyed portion includes a recess having irregularities.