Chapin 1949 Professional Industrial Concrete Pump Sprayer 3.5 GallonChapin's 1949 open head form oil sprayer is the best selling unit and is unmatched for quality. It's compatible for most professional concrete applications and extreme chemicals. 1949 has a 3. 5 gallon Tri Poxy tank for triple protection and a wide mouth opening for easy cleaning and filling. It features a solid brass pump barrel, nozzle and shut off, a 24 inch extension, and a 48 inch hose. The unique Tri Lock seal ensures the pump cap is on tight.