Pentair System:2 PLD Series Modular D.E. Filter delivers the unique benefits of D.E. filtration in a variation of their proven modular media technology. A single replaceable grid delivers water of superior quality without the complex workings of other D.E. filters. Tank and one-piece grid design make this filter virtually maintenance-free. The small diameter footprint makes the System:2™ filter a perfect fit for new and retrofit installations. Filter includes 2" NPT Drain ports, which are provided with reducer bushing and 1 1 per 2" drain plug.