400-1990 is a 1" FBT to 1" Slip tailpiece. This pump union includes the o-ring 805-0123, and is most commonly found on tiny might circulation pumps.
Manufacturer: Waterway Manufacturer Number: 400-1990 If it is a part we sell then it is a part we have had hands on experience with meaning we can help with technical issues and understand which products are better then others. Spa Parts Online sells genuine waterway pump parts.
