Watts’ Backflow Preventer Retrofit-Spool solution is a replacement for aging or inoperative backflow preventers. It has a unique outside-the-shutoff valve design that enables a wide range of configuration options. Its custom spool is pro-duced with optional connections, flush ports, branches or tees. Built to order, it can be tailored to meet various job requirements and can be delivered fully assembled or in parts. Most orders ship within 48 hr. of receipt. Watts Water Technologies.