Rescue. POP. Fly Refill works inside the Rescue! reusable POP. Fly Trap. Each refill packet contains one application that generally lasts two weeks to a month. Just drop the water soluble pouch into the trap container, add water to the fill line, replace the top and hang or place the trap outside near a fly source. Unit: EA UPC: 042853751173 Model Number: PFTA-DB12