Rainbird Plastic Shrub Adapter with Screen and Female NPT and Nozzle Thread, 1/2" Adapts Rain Bird nozzles for use with 1/2 in. (15/21) MPT threaded risers Accepts protective, non-clogging 1800 Series filter screen (shipped with nozzle) and PCS Series screens Durable, non-corrosive plastic construction Fine top threads accept all Rain Bird nozzles