I have an Atlantis pool and I am looking for is top rail connector part number 3474
Hi, Could you please take a look at this link Atlantis Top Connector and let us know if this looks like the part you need. Also please compare against these Atlantis Top Connector Dimensions.
That is an Asahi top cap. Unfortunately, we do not carry parts for that brand. We recommend trying https://www.asahiparts.com/