Single nozzle - posterior wash- cold water- adjustable water pressure: minimum 10 psi to maximum 99.6 psi depending on your bathroom's water pressure- fits most 1 piece and 2 piece toilets but will not fit french curve toilets. please first check. easily install underneath your existing toilet seat.- DIY easy installation- manual nozzle cleansing ("clean", turn the knob to the left), backwash (turn knob to the right)- retractable nozzle- use less toilet paper. Eco-friendly.- includes all or most hardware: braided metal hose for cold water, 7/8" metal t-valve with packing, single nozzle. Please check if you need other installation parts for your bathroom. You will need a screwdriver and wrench. Material: abs- cleaning instructions: please clean with a mild detergent, such as baking soda mixed with vinegar as strong household chemicals may deteriorate the plastic.