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20" Filter Housing with 3/4" NPT Ports
Lead time: Pressure Release (R50069) is in stock and ships now. No Pressure Release (R50070) has an expected restock date of November 12, 2026.
Choose your configuration above: Pressure Release (part R50069) adds a stainless bleed button on the inlet side of the cap so you can vent trapped air and pressure before opening the sump. No Pressure Release (part R50070) is the plain cap for installs where the system can be depressurized at a faucet or bypass.
Key specifications
Housing only — add hardware as needed
- ✓ Reinforced polypropylene cap (slate)
- ✓ 20" opaque slate polycarbonate sump
- ✓ #241 EPDM O-ring, factory installed
- ✓ Pressure-relief button assembly (PR model)
- ✗ MC-1A mounting bracket (150578)
- ✗ SW-1B sump wrench (R50295-06)
- ✗ Filter cartridge
Need the bracket and wrench included? Pentair's kitted versions (R52047 slate, R52018 clear) bundle the housing with its installation hardware.
Materials and operating limits
| Sump Material | Polycarbonate (Slate) |
| Cap Material | Reinforced polypropylene (Slate) |
| O-Ring | #241 EPDM, radial seal |
| Button Assembly (PR) | 300-series stainless steel, EPDM, polypropylene |
| Port Size | 3/4" NPT inlet & outlet |
| Cartridge Size | 20" x 2.5" (fits 2-1/2" to 2-7/8" diameter) |
| Maximum Pressure | 125 PSI (8.6 bar) |
| Temperature Range | 40–125°F (4.4–51.7°C) |
| Initial Pressure Drop | 1.7 PSI @ 10 GPM (0.11 bar @ 38 Lpm) |
| Maximum Dimensions | 22.51" x 5.00" (572 mm x 127 mm) |
| Weight | 6 lb |
| Certifications | NSF/ANSI 42 and CSA B483.1 (R50069); NSF/ANSI 42 (R50070) |
| Replaces | Pentek 150069 / 150070 standard housings |
Why Pentair moved the standard housing to polycarbonate
Polycarbonate Sump
Dura-Series sumps are molded from polycarbonate instead of polypropylene or SAN, for a tougher housing that shrugs off the stress of repeated cartridge changes.
Radial EPDM O-Ring
The radial seal design seats the O-ring on the side of the sump, so the seal doesn't depend on how hard you tighten — it resists leaks from over- and under-tightening alike.
Hard-Stop Threading
The sump threads to a positive stop against the cap. When it stops, it's fully installed — no guessing, no cracked caps from cranking too far.
Drill Bosses & Mount Points
Cast-in bosses on the cap accept pressure gauges and sensors, and dedicated mounting locations line up with the standard MC-1A bracket.
Four steps to a leak-free install
- Shut off the water supply and open a downstream faucet to relieve pressure. Allow at least 2-1/4" of clearance below the housing for cartridge changes.
- Wrap the 3/4" NPT inlet and outlet threads with PTFE tape and plumb the cap in the direction of the flow arrows. Mount the cap to the wall with an MC-1A bracket (sold separately).
- Apply a generous coat of silicone grease to all surfaces of the EPDM O-ring and seat it in the sump groove. Drop in your cartridge and thread the sump up until it stops against the cap.
- Turn the water back on slowly, press the pressure-relief button (PR models) to purge trapped air, and check for drips before closing the faucet.
Pro tip: Pentair rates the sump for replacement every five years. Keep a spare #241 EPDM O-ring (R51120) on hand and swap it any time you see nicks, flattening or weeping at the cap.
Drop-in replacement for any 20" standard housing
The Dura-Series keeps the same footprint, thread pattern and 3/4" NPT port spacing as the Pentek standard housings it replaces, so it retrofits into existing MC-1A brackets and existing plumbing without rework. It accepts every 20" x 2.5" cartridge we carry — Pentek sediment, string-wound, pleated, GAC and carbon block, plus IPW, Omnipure, KX and other standard-size cartridges from 2-1/2" to 2-7/8" in diameter.
Ships from California
Packed and shipped from our Santa Ana warehouse
Genuine Pentek
Authentic Pentair Dura-Series product with the Pentair symbol molded inside the cap
Build Help
Not sure what fits? Call (877) 541-6603 and we'll match the right housing, cartridge and hardware
