Get current pricing for Bel Composites, ORL4-S-300-1M Bel Composites Model Orl4-s-300-1m Ro Housings. 4-inch, 1-long Vessel Rated At 300 Psi. Side Ports Are 1 Victaulic And Located In Positions . Product Category: Process Equipment, Sub Category: Reverse Osmosis Equipment: