This poly blend manifold is excellent for 12V systems or air diaphragm systems.  The bypass side is plugged. It has a 3/4 outlet to your reel, a 3/4" inlet meter valve for bleach, 3/4' inlet ball valve for water, and a 1/2" inlet meter valve for surfactant. If you dont want to use the surfactant valve, and add your surfactant like I do, then you can use it for another chemical like DougOut Degreaser or RAP for cleaning gutters and oxidation. Are you starting a pressure washing business? Check out my Online Pressure Washing School that will help you drastically cut your learning curve. You can also get some great pressure washing tips and tricks at my YouTube Channel. As always, if you have any questions I can help you with, please use our CONTACT FORM.