Without boring anyone with details the mounting base balls are 20mm. This coupler is for 25.4mm balls. Not sure why in the world they don't all interconnect but I'm sure there is a reason I can't think of. I assumed it was plug and play but you have to be very careful as I just made an expensive mistake. My assumption and not reading the details will not diminish this product from a 5 star rating. BMS is a fantastic company and I will order the correct connector that I need after triple reading the details.
Hello Gary, thank you for taking the time to write a review. Please reach out to customer support if you need any assistance or have questions. We are happy to help. We can be reached at email@example.com