TM 10-5430-243-12&P 0019 00 0019 00-7/8 blank Change 1 Table 1.  Unit Preventive Maintenance Checks and Services For 20,000 and 50,000 Gallon Collapsible Water Storage Tanks (continued). ITEM NO. INTERVAL MAN- HOUR ITEM TO BE CHECKED OR SERVICED PROCEDURE EQUIPMENT NOT READY/ AVAILABLE IF: 20 Quarterly Vent Fitting   Assembly (5) Inspect for evidence of leakage, damage, or missing parts.  Check the vent cap for cleanliness and freedom of operation.  Check if the vent cap gasket, flat rubber gasket, or cam- lever arms are damaged or missing. Any evidence of leakage.  Vent cap is damaged or missing.   Vent cap gasket, flat rubber gasket, or cam-lever arms are damaged or missing. 21 Quarterly Filler/Discharge Assembly Couplings and Hose Attachments (6, 7) Inspect for proper connection, leakage, and loose or missing gaskets. Couplings are damaged or loose.  Hose fittings straining fabric.  Hose is leaking or damaged. 22 Quarterly Drain Fitting   Assembly (8) Inspect for missing gaskets or damaged coupling arms. Gaskets missing or damaged coupling arms. 23 Quarterly Type III Repair Kit (9) Check for missing components. Repair items are missing. 24 Quarterly Ground Cloth Inspect for punctures or tears. Ground cloth is damaged. 25 Semi- annually Drain Fitting   Assembly (8) Check immediate area for evidence of leakage.   Check drain plug, hose, or ball valve for damaged or missing parts. Any evidence of leakage.  Drain plug, hose, and ball valve are missing, improperly connected, or damaged. END OF WORK PACKAGE