Nelson Gear Drive Sprinkler on Metal Sled Base with Flow Control 1204 Gear drive sprinkler that incorporates features from two products into one Pulsating sprinkler coupled with the superior even coverage and the quiet operation of oscillating sprinklers Heavy-duty metal sled base with series connection and brass swivel coupling Built-in flow control eliminates having to run back to the faucet to make adjustments Flip-up trip collar clip for full or partial circle coverage