This practical compression sprayer suit for indoor and outdoor use. Which compatible with most commercial liquid fertilizers. NOT suitable for caustic or acidic (vinegar) solutions. Our pump action pressure sprayer with a pressure release valve and shoulder strap. If not often used, it would release the pressure automatically to make the sprayer serve longer Package Included: 1 * Garden Pressure Sprayer Material:PP&PE Plastic Color:Black&Red Tips 1.Fill water not more than scale, also not too little. too little water requires a big increase in pumping. 2. After installing water, make sure to tighten the air rod,if not, the air will leak out. 3. After tightening, cheer up, and down, the hand can feel the obvious resistance then you can spray. 4. After using medicine or fertilizers(especially powder), the remaining liquid should be emptied in time, and plenty of water should be added to clean the spray pipe.