Upgrade Soap Dispenser Bottle: Compared to others, our soap dispenser bottles are thicker, making them durable and less likely to break. We increased the thread width at the connection between the soap bottle and foam part for easy installation and to prevent falling off. The included teflon tape seals to stop water leakage. Upgrade Thumb Control Design: Instead of straining fingers with a trigger handle, the dog washer hose attachment operates effortlessly with a thumb push to turn on and control water flow. Whether your hands are slender or stout, you ll stay comfortable without hand fatigue. Build-in Soap Dispenser Bottle: The dog wash hose attachment has a soap dispenser bottle that mixes soap solution with running water to spray foam, so you don t need to prepare foaming water separately. Adjust the foam dilution ratio with the dial above the bottle for convenience.