Comprehensive Accessories Set - The maintenance kit for Berkey travel water filter system elements includes rubber plugs, washers and wing nuts, they are for Berkey BB9 black filters, for Travel, Big, for Royal, for Imperial, for Light, for Crown for Berkey Series. Longer Lifespan - Water filtration replacement parts can maximize the service life of the water filtration system. Designed for easy DIY maintenance, which can solve the problem of wear and tear of the parts and make the service life of your components longer. Improved water quality - Precision washers and wing nuts provide a secure connection and prevent leaks, which enhances the reliability of your stainless steel water filter, ensuring your system operates at optimal efficiency. Economical Choice - The rubber plugs are for Berkey series all models, the washer and wing nuts are suitable for BB9 black warter filter only. we provide a cost-effective alternative, don't break the bank by replacing your entire system. Variety Pack - The package contains 4pcs rubber plugs, 4pcs washers and 4pcs wing nuts, Simple and quick installation. Replace parts as needed to keep your water filter performing at its optimal level, and keep spares for backup when you need them. Color: Black Material: plastic Package Contents: 1 x Replacement Kit Only the above package content, other products are not included. Note: Light reflection and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.