This is a 6 oz Glass reservoir jar (and polypropylene safety cap) for use with the 267 Preval Sprayer. The 100% glass reservoir is easily cleaned, reusable and recyclable. Preval's glass reservoir was specially designed to withstand the impact of an 8 ft. drop onto concrete. The glass reservoir safely stores volatile liquids such as varnishes, oils and paints. Glass is inert and will not leach.