The Watts FH4200WW34 Flowmatic is a heavy-duty 10-inch standard filter housing engineered with thick-walled FDA-grade polypropylene and buttress thread design for industrial-strength sealing. Built to resist aggressive chemicals while handling flow rates up to 100 PSI, this housing accepts any standard 2.5" x 10" cartridge with secure 3/4" NPT ports.
SPECIFICATIONS
Watts FH4200WW34 Technical Details
| Model Number | Watts FH4200WW34 Flowmatic |
| Housing Size | 10 inches (standard) |
| Cartridge Compatibility | 2.5" x 10" standard cartridges |
| Port Size | 3/4" NPT (inlet/outlet) |
| Maximum Pressure | 100 PSI |
| Temperature Range | 40°F to 100°F (4°C to 37.8°C) |
| Material | FDA-grade polypropylene with EPDM o-rings |
| Chemical Resistance | Acids, alcohols, ammonia, oils, plating solutions |
INSTALLATION & USE
Installing the FH4200WW34 Housing
- Thread 3/4" NPT ports into your plumbing line using appropriate sealant rated for your application (PTFE tape or pipe dope).
- Insert your chosen 2.5" x 10" filter cartridge into the sump, ensuring it seats properly on the bottom standpipe.
- Lubricate the EPDM o-ring lightly with food-grade silicone grease, then hand-tighten the white cap using the buttress threads until resistance is felt.
- Pressurize the system slowly and check all connections for leaks before bringing to full operating pressure.
COMPATIBILITY
Cartridge & Application Fit
The Watts FH4200WW34 accepts any industry-standard 2.5" diameter by 10" length filter cartridge, including sediment, carbon block, pleated polyester, and specialty media types. The housing's chemical resistance makes it suitable for aggressive municipal, industrial, and agricultural water applications where standard housings would degrade. Note that this is a non-pressure relief valve style, so ensure your system includes appropriate overpressure protection upstream.
🔧 Pro tip: The buttress thread design on the FH4200WW34 means you don't need to crank the cap with a wrench. Hand-tight is sufficient when the o-ring is properly lubricated. Over-tightening can actually compromise the seal and make future cartridge changes difficult.
