Model 6518FR freeze-resistant bury valve for use with single bubbler head pedestal fountains shall include a brass pneumatic operated valve installed below the frost line, check valve to drain water from unit when not in use and to prevent back-flow cross contamination, regulator valve, separate valve access and pull-out design for easy maintenance, 6 in (15.2 cm) Dia PVC pipe to encase valve assembly and 1/2 in IPS supply.