Orion® T11 POU Anti-Siphon Dilution Trap vessel shall be cylindrical seamless, stress and defect free, rotationally molded construction to uniform wall thickness from virgin PE resins conforming to ASTM D 1248. Trap vessel shall be 1, 2, or 5 USG capacity. Trap top assembly shall be threaded and gasketed to vessel, and shall have height adjustable top FNPT inlet with dip tube and fixed side MNPT outlet.