UPP™ brand Nexus Series™ under dispenser containment sumps (UDCs) combine a completely optimised containment space with the latest in double wall piping technology to deliver a truly state-of-the-art containment space. By incorporating an advanced UDC with UPP™ double wall termination fittings and Gemini™ secondary containment pipe fittings, you get superior watertight containment with faster and safer installations.