Abstract: An exhaust muffler for outboard motors which is fastened to the rear end of the propeller hub and directs the motor's exhaust back into the hub of the propeller and out through the front of the propeller and the by-pass exhaust ports of the motor. The muffler includes an elastomeric member and a blocking member with the blocking member having pressure relief mechanism therein.

Abstract: A hose coupling wrench apparatus includes first and second movable wrench members, each having a handle and an arcuate arm attached thereto. The arcuate arms of each wrench member have arcuate slots therein, and each has a hose coupling engaging portion on each end of each arcuate arm. A slider member connects the two arcuate wrench portions together in a predetermined spaced relationship to each other to allow the wrench portions to slide one relative to the other. The slider member has a pair of curved sliding blocks on each end thereof, with each block sliding in the slot of one wrench portion and supported on one side of the arm by the slider member and on the other by fastening members. The hose coupling wrench can engage hose coupling sections with each movable wrench member. One wrench member can be moved relative to the other to couple or uncouple a hose coupling.