*PLUMBERSSTOCK EXPERT* responded:
Hi! We are happy to know that you are interested in our Rain Bird PSIM40X100 Pressure Regulator (40 PSI). Yes, this pressure regulator can be installed horizontally. Please refer to this Specification Sheet and page 3 of the Tech Manual , for more information. I hope these helps! You can order it now by clicking Add to Cart and entering your zip code on the next page. For more inquiries, you may contact one of our customer support specialists at 435-868-4020 or through e-mail @ email@example.com. Thank you for visiting PlumbersStock.com! Have a nice day!