Our Maintenance Manager states that the sinks he purchased (awhile back) were equipped with backflow devices. He can't prove it. I've heard of some customers requiring the sink and hose drop back flow devices be replaced at least annually.
We have a main backflow installed and it is checked annually by a 3rd party.
If my plant does not have a back flow device on sinks and hose drops in production areas, would this be an NC for BRC? Or is it a best practice to have them on sinks and hoses and replace them annually (with documented proof of course)?