Champion Compressor Z-TD-1 Automatic Tank Drain Valve Assembly Repair Kit Z5941 The Z5941 Automatic Tank Drain Repair Kit is designed for use with Champion Air Compressors. This kit comes with everything you need to rebuild your Z-TD-1 drain. Please see below for everything that is included. Includes: Diaphragm TD-9 O-Ring TD-16 Valve Stem TD-7 Valve Disc TD-3 Disc Back-Up Washer TD-18 Hex Nut M2932 Valve Spring P1882A Gasket TD-17