DIY: How to Make Industrial Curtain Rods - That Look Like Copper - using pvc pipe, a connector, a flange and copper spray paint, you can create your own rods for very little money - via Our Vintage Home Love
paint over pvc that looks like copper....I've used real copper pipes years and years ago (still do) . I love the patina and all of the available fittings, t's, elbows, couplers, bendable tubing, flanges, caps alone or to attach finial I've made or purchased. I've used copper with brass, with black wrought iron...I imagine it cost more now (I used a heavier pipe because of the span of the window).
Schluter Kerdi Shower Kit 32 X 60 Center Drain Tray Tileable Covering Support - Pvc Flange
FE Series PVC butterfly valves are rubber lined (resilient seated) with wafer flange connections. They can be manually operated with a lever or geared hand wheel, or automated with an electric or pneumatic actuator.