Heavy-duty 13 In. stakes with adjustable 8 In. rigid riser for use with low-volume sprinklers and spray heads with 10-32 NFT inlets. Screw the sprinkler/sprayer into the rigid riser moving it up or down to water above plants. Attach 1/4 In. supply tubing to 1/4 In. barb on 8 In. riser.