TM 9-2330-267-14&P2-15. OPERATION IN EXTREME COLD (Con’t).CAUTIONTrailers equipped with fiberglass water tanks may not use the M67 immersion heater toprevent them from freezing. The heat generated by the M67 immersion heater will meltor otherwise damage the fiberglass water tanks.d. Trailers equipped with a stainless steel watertank may use the M67 immersion heater to preventcontents from freezing. Refer to TM 5-4540-202-12&P foroperation and maintenance of the M67 immersion heater.Below are general mounting instructions for M67immersion heater use:(1) Remove nut (4), washer (6), and heaterbracket (5) from trailer front frame assembly (7).TA5069822-19
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