52=Category Code

307=Filter Type
 

50 = Filter, inline type.

51 = Filter, Drier with dual connection.

52 = Filter, Aluminum drier with flat top connection.

54 = Filter, Valve In Receiver (VIR) & parts.

55 = Accumulator & part for GM CCOT system.

56 = Accumulator & part for Ford CCOT system.

57 = Accumulator for Import CCOT system.

Associating with Category 50: 

100-199 = Barb connection.

200-299 = Compression connection.

300-399 = Molecular sieve type.

600-699 = Spring lock type.

700-799 = Pancake type

Associating with Category 51: 

000-099 = Barb type.

100-199 = Flare type.

200-399 = Male O-ring type.

400-499 = Female O-ring type.

500-599 = Quick disconnected type.

600-699 = Male-Female type.

700-799 = Spring Lock type.

800-899 = Dual plate type.

900-999 = Male O-ring metric type.

Associating with Category 52: 

000-099 = Chrysler products.

100-199 = Ford products.

200-299 = BMW products.

300-399 = Various imports.

Associating with Category 55: 

000-099 = Accumulator tube.

100-200 = Accumulator universal.

400-449 = Accumulator small head.

450-499 = Accumulator Saturn.

500-599 = Accumulator 180° straight.

600-699 = Accumulator 120° right.

700-799 = Accumulator 120° left.

800-849 = Accumulator 90° right.

850-899 = Accumulator 90° left.

900-945 = Accumulator 45° right.

950-999 = Accumulator 45° left.