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Drain Valve 30in-60in Cable 1/4in NPT Thread This Part Also Available in Excel EM36620 Part number: LDV-3662 OE MFG: MACK OEM Reference: 20QE2121P3 Cross Reference: MACK : 20QE2121P1, 20QE2121P3, 5396-12105; OTHER : 111-48, 12104, 12105 Product Class: Air Valves & Kits The PAI LDV-3662 is a drain valve with a 30- to 60-inch cable and 1/4-inch NPT thread, listed with Mack OEM reference 20QE2121P3. Drain valves are heavy duty diesel truck parts that provide a controlled way to release accumulated fluid or condensation from an air or fluid system. The cable range and thread specification help distinguish this configuration, while Excel EM36620 is also listed as an available part reference; Mack references 20QE2121P1 and 5396-12105 provide additional identification context.