Hi Pete,
Thank you for your review of the 75699SN. I am sorry to hear that the unit is not what you expected. Quality is very important to us, and our products undergo rigorous testing to ensure high-quality performance. Your feedback is important to us, as it helps us refine our products and services. On Page 3 of the Installation Guide (linked below), you can find where it is mentioned that the two parts snap together.
https://media.deltafaucet.com/MandI/104192%20Rev%20C.pdf
Please contact us with any further questions.
Best regards
Emma
Digital Communications Specialist