Valterra F02-2024 Drain Hose Coupler - 45°, 3" Hose x 3" Hose. Since 1981, Valterra Products, LLC, has been a leading supplier of brand name product lines to the RV, Pool & Spa, and Plumbing industries. Valterra’s Contract Manufacturing Division offers low-cost custom manufacturing and assembly services to client companies seeking to reduce costs and improve the bottom line.