The Worthy Strainer fits on the bottom of the Spray Gun suction tube, it is continually straining the finish as it is being sprayed. I have used Worthy Strainers (made by Worthy Mfg.) for over twenty years and would not spray a finish without one on my Spray Gun.
Over 5 Square Inches of Straining Area
All Joints Securely Clinched
Adjustable Poly Tube Gasket Grips Securely
The strainers tend to get clogged a bit more with paints, and water
based finishes than with solvent based clear finishes.
Read about Worthy Strainers at Woodworker's Journal eZine