{HEAD ~ Each} of {TAIL ~ the plurality} of transducer ports can define an aperture and a counter bore, wherein each transducer is positionable in an associated transducer port with the flange of the header of the transducer being welded to the counter bore of the transducer port 
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{ HEAD ~ Each } of { TAIL ~ the plurality } of transducer ports can define an aperture and a counter bore , wherein each transducer is positionable in an associated transducer port with the flange of the header of the transducer being welded to the counter bore of the transducer port
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