Water Fed Sanding System - Take the water with the sanding block with the unique Wet Wedge system. The 10' water feed hose with flow adjustment valve connects to any common garden hose. Wet sanding speeds results while extending the life of abrasives. Use the water fed (31246) Wet Wedge 5in. x 2-3/4in. ridged sanding block to smooth flat primed surfaces. Use the water fed (31247) Wet Wedge 5in. x 2-3/4in. flexible sanding block to smooth curved primed surfaces and color sanding top coats. Use the (31248) Wet Wedge classic flexible sanding block for wet or dry color sanding. Made in the USA.