Rain Bird 5000 SAM rotors feature the Seal-A-Matic check valve, which is capable of withstanding up to 7 ft. of elevation change, preventing puddling and erosion caused by low-head drainage. Rain Bird 5000 Seal-A-Matic sprinkler headsĀ provide you with all the great features of the 5000 series sprinkler heads, with added low-head drainage protection, keeping your plants healthier and your wallet fuller.