Non-return 19 mm (3/4") 90° valve | 4BoatsCompact 90 non return valve with a 19 mm (3 4") outlet, designed for marine bilge, freshwater and discharge plumbing where inline protection is needed. Prevents reverse flow to protect pumps and systems 90 outlet for right angle installation in tight spaces 19 mm (3 4") outlet fits standard 3 4" hoses and fittings Inline fitment installs directly into hose runs without modification Suitable for bilge, freshwater and discharge plumbing