R&B Company Redwood City

I went to R&B Co. on the recommendation of a friend because I need to replace a sump pump and find some parts for the set up I currently inherited with my house. The folks here were very helpful. They have a few people behind the desk who come out and help you. I had to wait in line for a few minutes but I could see they were taking their time with the current customers and being very thoughtful.
You tell them what you are looking for, they proactively ask you questions about it, make suggestions and take their time helping you get what you need.
Their website lists them as a supply warehouse for various utilities related to plumbing and piping. The warehouse has seems to have a lot of the items in stock or they can order them.
I would recommend going to them if you are not sure what you need. They take the time to understand the job you are trying to do. It helps if you can bring a picture or diagram and measurements as I did.