Victaulic Company of America's (Easton, PA) new Series 771 OS&Y and Series 772 NRS grooved-end gate valves feature IPS ends and a Positive Displacement Disk(tm) (PDD) that is designed to provide bubble-tight sealing with minimal torque. The valves are UL listed and FM approved for service up to 200 psi, are available in 2-1/2 in. through 12 in. sizes, and are offered with optional wall (Series 772) or upright (Series 774) post indicators.