Backflow Valve For Garden Hose. If your neighbors house is on fire and there are firemen using fire hoses to put it out the amount back pressure needed could actually suck the dirty water out of the bucket your using to wash your car. Any drop in water pressure can cause the supply system to ingest chemicals from fertilizers into the hose.
Without a backflow preventer attached to the garden hose faucet line there is the possibility of contaminants or chemicals entering the water supply. Let me explain it like this. When homeowners use a garden hose or a sprinkler system in their garden backflow can occur if the hose is left on the ground.
This small device keeps water flowing one way and does not allow water to reenter the water pipe once it has entered the hose.
For us as RVers its as simple as a garden hose left in contact with contaminated water hooked up to the hose bib. Shut-off valves partially or fully stop flow. The RPZ valve design works best with a relief valve opening if either of the check valves declines. Backflow happens when a fresh water system gets cross connected with a source of bad water or other contaminant.
