With the use of both water and air the GT1090 pulses the water through the system giving a greater chance to remove debris from the system when flushing. 
The unit can also be used normally without the pulse action 
Comes with two sizes in conical adaptors allowing it to be used on a wide range of hoses.

Included:
Large conical adaptor 18mm - 45mm
Small conical adaptor 9.7mm - 25.7mm 
Heater core adaptor 5/8”
2x 20mm-32mm Hose clamp
Heater core adaptor 1/2”
2x 16mm-27mm Hose clamp
Garden hose adaptor
90° Quick Release Connector

Barcode # 9322159310900