For the maximum in convenience, reliability and ease of service in a residential valve, the PGV Screw-Top is the solution. With the PGV Screw-Top, it's possible to service a Hunter valve without using any tools. Even with this ease-of-maintenance and operational simplicity, the PGV Screw-Top still delivers quality and performance to handle the demands of any residential system. Choose from a wide range of different configurations for specific installations that vary from region to region. All models feature durable, high-grade, corrosive and UV-resistant PVC construction, glass reinforced rugged double-beaded, leak-proof diaphragm with support to prevent stress failure.