*PLUMBERSSTOCK EXPERT* responded:
Hi, there! Thank you for asking us here at PlumbersStock.com! This nozzle cap is designed to fit the Milwaukee 6560-24 (SER 282A), 6560-24 (SER 282B), 6562-24, 6560-20 (SER 282B), 6560-20 (SER 282A), and the 6560-29 caulking guns. It would be best if you can provide us with the make and model number of your caulking gun so that we may be able to identify the cap that you need. Thank you and we hope to see you around at PlumbersStock.com.