These versatile rubber gasket washers are essential components for creating reliable seals in plumbing applications. Designed specifically for 3/8-inch compression cap fittings and brass shut-off angle stop valves Cap, this pack of 100 washers ensures you'll always have spares on hand. Each washer is precision-made from durable black rubber to provide consistent performance and prevent leaks. The washers feature a uniform thickness and carefully sized center hole for proper alignment during installation. Perfect for both professional plumbers and DIY enthusiasts, these washers are compatible with standard compression fittings commonly found in kitchen and bathroom fixtures. Their robust construction helps maintain tight seals under normal water pressure conditions. Keep your plumbing connections secure and leak-free with these dependable rubber gasket washers. Pay special attention : The inner diameter of the washer middle hole is about 4mm, So it only suitable for cap fitting, or it will only allow a much small flow rate.