Flexitank 1.4layers PE+1layer PP+3 inch valve 14KL-24KL 2.Product liability insurance 3.ISO9001,FDA,EC,KOSHER,COA Our advantages 1. LET Flexitanks use our special valves made from high strength alloy steel nanometer polypropylene (pp) , with higher strength, temperature and corrosion resistant compared to normal polypropylene or strengthened one2,All valve bodies are connected by 8 stainless ...