Originally Posted by mitchgo
Having a blow out installed prior to the back flow assembly is illegal and is a form of cross contamination.
Up here when we see this.. We always recommend to take it out and install it down stream of the bfp
Try not to devalue your contributions by assuming your local customs are the law of the land. Besides, the upstream blowout valve is only an opportunity for someone to introduce contamination, and that is a different animal than an actual cross-connection.