MODULAR SELECTA-SYSTEM BASE | EC1161PAK Hayward Modular Selecta-System Base (EC1161PAK) Replacement base designed for use with Hayward EC series pool and spa filters, such as those in the Perflex Extended-Cycle DE filter line. This modular base provides a stable foundation for the filter system and helps organize and secure associated components. Function: As the primary mounting platform for the filter, pump, and other system components, ensuring stability and proper alignment during operation. Modular Design: Customization and integration with additional system components, making it adaptable for various pool setups. Compatibility: Designed for Hayward EC Perflex filters and compatible models. Durable Construction: Heavy-duty, chemical-resistant materials, capable of withstanding exposure to pool chemicals and outdoor environments. Ease of Maintenance: The system is elevated and organized, making maintenance tasks more accessible and convenient.