MULTI-PURPOSE. Proper Pour PVC tubes are ideal for general use such as beer brewing, kegerator, wine making, milk and food handling and processing, air hose for fish tanks and aquarium, aquaponics, hydroponic, ponds, indoor water garden, drip irrigation, drain, water line, pumps, vacuum, siphon, filters, air conditioning, humidifiers, other home uses, props, plumbing, refrigeration, dental, industrial, medical, surgical, laboratory applications for transferring liquid and gas.