The most popular uses for Polypropylene ppr water pipe fittings are in the transportation and handling of liquids. These applications usually consist of pumping or transferring fluids between containers such as tanks, drums, pails, jugs, kegs, etc. Pumps such as diaphragm pumps, peristaltic (rubber) tube pumps, and piston/plunger pumps are the types commonly used with polypropylene tubing to transport these fluid products. A few examples would be in dairy farms where the product is milk, in beverage industries handling beer products or malt beverages, and in commercial kitchens where salad dressings for salad bars are being kept cool.