R18S Max Drive 1.25" Sprinkler Cam Lock Fittings simply request a threaded adapter Select a Product:Coupler Part B 4" Aluminum simply request a threaded adapter to convert to 1 1 2" or 2" at no extra charge when ordering The Gemini is constructed from quality materials which make it very unique The R18S Max Drive Impact Sprinkler System stays consistent at low and high pressures The Max Drive action of this sprinkler uses the perfect combination of drive arm spring tension and engineered mechanical designs to display a beautiful stream pattern in forward and fast reverse mode that results in the absolute best wetted water pattern all throughout the diameter of the circle