Instruction: Given a question and the related document, predict if the question is answerable based on the information provided in the document. Output only yes or no.

Input:
Question: what size valve is used?  1" or 1 and 1/4"?
Document: great replacement for my 30 year old rainsoft unit that i cound not get replacement parts. i installedthe unit in four hours after a visit to home depot.
We are happy with this filter and it work great. Our water now is so much better. And the customer support was also great
Installation instructions are tedious and confusing and no user manual, but after fighting through the installation . . . what a difference in the quality of the water! Clothes look cleaner, soap and shampoo work better, hair feels cleaner, shower walls stay cleaner. I am very pleased.
Answer: no