a pair of spaced clamps surrounding said exhaust pipe and passing respectively over the wings of said heat exchanger for clamping said bottom plate against said portion of said exhaust pipe so as to urge said bottom plate into {HEAD ~ contact} with said portion of said exhaust pipe, said clamps being moveable outwardly of said wings for {TAIL ~ releasing} said heat exchanger 
a pair of spaced clamps surrounding said exhaust pipe and passing respectively over the wings of said heat exchanger for clamping said bottom plate against said portion of said exhaust pipe so as to urge said bottom plate into { HEAD ~ contact } with said portion of said exhaust pipe , said clamps being moveable outwardly of said wings for { TAIL ~ releasing } said heat exchanger
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