1-1/2" - 1-1/4", ABS/DWV Los Angeles Pattern P-Trap With Union Less Clean Out, Used To Prevent The Passage Of Sewer Gas From The Plumbing System Into House Through The Plumbing Fixture Drain, Used When Local Code Doesn't Permit The Use Of Slip Coupled Traps, For Non-Pressure Drain, Waste & Vent Installation, Low Chemical Resistance, Black Material.