Get current pricing for Bel, ORL4-E-1000-4M Bel Composites Model Orl4-e-1000-4m Ro Housings. These 4-inch, 4-long, End-port Vessels Are Rated For 1000 Psi. Feed/concentrate Port Is 3/4 Npt, Perm . Product Category: Process Equipment, Sub Category: Reverse Osmosis Equipment: