I have a black sealed vertical mount item, 3 in diameter, and 6Inches high. It is a plugin with 8 pins (2 rows of 4). It is manuf by Kurman Electric Co. Inc. Manuf part number P255A and it also is marked Signal Corps Stock number 4 TRY 30 anyone have any ideas? a web search did not help with the part number but yielded a few hits on the company but no Joy Ray