Package contents: pool piston valve and 1.25 inch to 1.5 inch Type B hose adapter replacement. Compatibility and function: compatible with most above ground pools on the market. Provides a combined connection for pool filtration pumps and above ground pools, increasing versatility and reliability. Easy installation and operation: installs on the pool wall with an attached shut-off valve for direct control of water flow. For 1.25 inch water pipes, install both accessories; for 1.5 inch pipes, install only the pool piston valve. Durable construction: made of durable plastic, with an elastic rubber ring to prevent leaks. Helps save water, supports safety and efficiency, and requires minimal maintenance for long service life. Use scenarios: - Replacing a worn or leaking valve and hose adapter on an above ground pool to restore reliable filtration and control. - Upgrading an existing setup to enable direct flow control and easier maintenance with 1.25 inch or 1.5 inch piping. - Seasonal pool opening or closing where quick installation and dependable valve operation improve setup and shutoff efficiency.