Transducers Thru Hull, Blackmore Electronics
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                   Thru-Hull Depth E26009Raymarine P7 nylon low profile thru-hull depth transducer for ST40. 
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                   Thru-Hull Speed E26008Raymarine ST40 plastic low profile thru-hull speed transducer E26008. 
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                   Transom Mount Transducer for ST40Raymarine Transom Mount Transducer for ST40 depth only multisensor features our 50/200 kHz dual frequency single ceramic element. This hydrodynamic housing features a rounded nose which reduces the turbulence under the transducer’s face for accurate high speed readings and clearer display images.E26027-PZ 
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                   Thru-Hull Low Profile Transducer E66013Raymarine Thru-Hull Low Profile Transducer E66013 (P-319)50/200 kHz, dual-frequency, single-ceramic element in a low-profile housing. Plastic, bronze or stainless steel models are available to accommodate all hull types. The nearly flush design minimizes drag with only 5 mm (3/16") extending outside of the hull.