Diversitech Pro-Flush&trade; HVAC Flushing Solvent &ndash; 8 oz. Refill A flushing solvent for A/C and refrigeration systems formulated for R-410A retrofits, refrigerant conversions and compressor burnouts. Compatible with all refrigerants and compressor oils. All solvents in Pro-Flush are non-VOC and conform to EPA SNAP standards: low toxicity and residue-free.