K-Rain ProSport1" Rotor Pro Sport Stainless Steel Rotor with CV 14003-SS stakes and pins The male thread size is

The male thread size is 3/4 inches and the male thread size is also 3/8 inches

Connection: Male Pipe Thread x Female Pipe Thread

then tighten with a wrench just until the bell cap can't wobble

A direct replacement for the Hunter PGP rotor

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K-Rain ProSport1" Rotor Pro Sport Stainless Steel Rotor with CV 14003-SS stakes and pins The male thread size isFeatures and Benefits Revolutionary Patented Easy Arc Set Simplified arc set allows for wet or dry adjustment in seconds Triple Nozzle Configuration Insures even distribution of water Six (6) numerically coded interchangeable nozzles included 2N1 Adjustable or Continuous Rotation Provides a full range of adjustment from 40 degree to a continuous full circle. Patented Arc Set Degree Markings Clearly indicates the current watering pattern and simplifies