The male coupler on the black end of the 0.5 GPH Add-a-dripper is significantly larger than other couplers, making it very difficult to connect the dripper to 1/4 inch tubing.  Despite extra care, I have broken a number of these in installation, and will probably not waste any more money on them.

Hi alanz12 !!
Just seeing this post and I am so sorry if you did not contact us directly since this post!!
We have since changed suppliers on this particular dripper due to them not meeting our standard of quality.
Please contact me directly at sam@misterlandscaper.com or sales@misterlandscaper.com so we can trade you out with our newer product.
Thank you for your business and I hope you have a great day!
Sam