TM 5-4220-233-14
Figure 1-4. Servicing Unit Flow Schematic, Sheet 1 of 2.
(2) Trough Assembly . The trough is an aluminum tank capable of holding up to four twin 80 SCUBA
cylinders. When filling cylinders the trough is secured to the rear bumper of the trailer and filled with water.
When the SCUBA cylinders are positioned in the trough the water acts a heat sink and prevents the cylinders
from overheating during the filling process. After filling operations are completed the trough is drained through
two drain valves and secured to mounting provisions on the curbside of the body assembly.
(3) Compressed Gas System. Tool Box. A weather-tight tool box is mounted on the inside of the curbside
control panel door. This tool box is used exclusively to store tools and spare parts required to maintain the
Compressed Gas System in a clean manner
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