1/4 Inch NPT In-Line Filter, 2 Inch Long with 1/4 Inch FPT (Inlet) x 1/4 Inch MPT (Outlet)

Interstate Pneumatics WR1010 1/4" NPT In-Line Filter, 2" Long with 1/4" FPT (Inlet) x 1/4" MPT (Outlet). General purpose filter protects tools and equipment by removing most solid and liquid contaminants. This may include dust, dirt , pipe scale, rust, liquid water and bulk oil. A 40 Micron filter element removes the smallest of particles. Help prevents costly damage to air tools caused by rust, scale and moisture. Convienient minimum installation time into your compressed air system.
Note:
Protect you tool from these three junk "intake" areas that plague tools
From the Compressor (filter gone, scale or moisture in tank, etc)
Between the Compressor & Tool (air lines, connections, etc)
The Tool itself (dirt, sand & water from truck, ground or jobsite)