Goes on with a deep well socket. The replacement faucet had the correct instructions and it has been problem free.While the problem could have been solved just by sending me new instructions (and avoided by documentation quality control), the fact that they were willing to send me a brand new faucet to fix a problem shows that the company will stand by their product and go out of their way to make sure you have a working faucet.It is a pleasure to use this, especially compared to my old two knob faucet. Maybe an hour tops and the job was done. Didn't even need a basin wrench. The heft of this part lets you know it is commercial grade.