The blade roller water kit attaches easily to the handle of your circular saw and allows the safe and efficient wet cutting of concrete, granite, marble and other natural stone. Water helps control dust and keeps the diamond blade cool and lubricated, thus extending blade life. The kit includes gfci, ball valve, diverter assembly and all necessary hardware for fastening to tool. Water cools and lubricates diamond blade, thus extending blade life. Helps control dust and particles.Gfci included for operator safety. Attaches to saw quickly and easily, does not alter saw.