This fitting is used to connect, expand, or repair Orbit manifold systems made and bought before 2008. This Orbit 57160 green manifold cap is used to close the ends of Orbit sprinkler manifolds. Simply twist it on and tighten in by hand. This cap is durably built of UV-resistant material to ensure multiple years of use. Features and Benefits: Covers Orbit valve manifold ends - Only for manifold made before 2008, Easily installs and tightens by hand.