558 Series Check Valve Overview | The Lee Company 

This threadless, cartridge-style, one-way valve is designed for installation into metal manifolds. The valve features The Lee Company’s field-proven locking end which provides secure retention without the need for threads, O-rings or sealants. Featuring an all-stainless steel design with a high-quality metal seat, the valve offers low leakage, repeatable cracking pressures, and long life. Models are available with an integral safety screen for increased protection against contamination and a ceramic ball. The valve is 100% performance tested. Learn more about this product www.theleeco.com/product/558-...