Rainbird 1804SAM Spray Head Body W/Sam 4 Pop-Up. The Rain Bird 1804-SAM is a 4" Pop-Up Spray Head with built-in Seal-A-Matic Check Valve. This spray head offers a built-in Seal-A-Matic check valve that eliminates the need for under-the-head check valves. This spray head prevents drainage from spray heads at lower elevations, stops water waste, and ends landscape damage due to flooding and/or erosion.
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