Keep your outdoor area looking great with the Roundup 1.25 Gal. Ready-to-Use Weed and Grass Killer Pump 'N Go Refill. Designed for use with the Pump 'N Go unit, this ready-to-use weed killer provides post-emergent control. Guaranteed to kill weed and grass from the root. | RoundUp Weed and Grass Killer Exclusive Formula Refill | Size 1.25 gal