Gilmour 9200 Mechanical Water Timer, Teal (Discontinued by Manufacturer) Measures gallons or approximate minutes. Dial can be set for automatic shut-off at any point up to 700 gallons or 4 hours. Includes manual on/off settings. Attaches to faucet, hose or sprinkler. Swivel nut for easy connection. Minimum flow rate is 2 GPM for proper operation. Works with water pressure ranging from 15 PSI to 120 PSI.