Brand new check valve assembly: 5140030-78. This check valve works with the following models: DeWALT: D55151 Type 1 Compressor, D55151 Type 3 Compressor, D55152 Type 1 Compressor, D55153 Type 1 Compressor, D55153 Type 2 Compressor, D55153 Type 3 Compressor, D55154 Type 1 Compressor, D55152 Type 2 1.1HP Compressor, AM390 Compressor, AM782HC4V Type 1 Compressor, AM782HC4V Type 2 Compressor.

Specifications:

Valve Inlet Threads: 3/8" Compression (measures about 9/16" outside diameter)

Outlet Threads / Tank Threads: 1/2" Male NPT (measures about 3/4" outside diameter)

Side Port: 1/8" Female NPT (measures about 10/32" inside diameter)

Unloader Assist On Top - Helps with Start Up / Shut Off 

Total Length: 3"