No more opening and closing of bottles—just tap the cap on surface to dispense glue. Spring-loaded stopper allows for easy dispensing while it keeps air out. 7/8" diameter cap fits any standard size glue bottle. Mounting Application: Tap-N-Glue®; For Use With: Liquid Glue Bottles; Compliance, Standards: N/A; Pre-Consumer Recycled Content Percent: 0 %. One dispenser cap.