This Two-Gun Tee Coupler converts a one-gun pressure washer into a two-gun system. This is a good way to power wash on a big job if you don't have 2 machines Quick connect this Branch Tee onto the pressure washer outlet, then connect two pressure washer hoses to either end of the 2-gun splitter. Allows for 2 pressure washer users simultaneously Attention: Ideal for pressure washers higher than 4.0 GPM. When running two guns simultaneously, this coupler splits the GPM between the two guns and it is necessary to change the pressure washer nozzle to achieve desired results Y shaped, made of Brass. Fitting: 3/8’’ quick coupler plug + 3/8’’ quick coupler socket Working pressure is up to 5000 PSI This Two-Gun Tee Coupler converts a one-gun pressure washer into a two-gun system. This is a good way to power wash on a big job if you don't have 2 machines. Quick connect this Branch Tee onto the pressure washer outlet, then connect two pressure washer hoses to either end of the 2-gun splitter. Allows for 2 pressure washer users simultaneously. If your pressure washer produces 4.0 GPM, 4000 PSI, it requires a size 4.0 nozzle. When splitting the GPM between the two guns, you would instead use TWO 2.0 nozzles, allowing each gun to receive 2.0 GPM, 4000 PSI. Pressure (PSI) and flow rate (GPM) can be adjusted by changing the nozzle size.