The Watts FH4200BB34 Flowmatic filter housing combines industrial-grade polypropylene construction with a buttress thread design for dependable filtration in residential and light commercial applications. Built with reinforced sidewalls and triple O-ring sealing, this 10-inch standard housing handles aggressive water chemistry while maintaining pressure integrity up to 100 psi.
SPECIFICATIONS
Watts FH4200BB34 Technical Details
| Model Number | Watts FH4200BB34 Flowmatic |
| Housing Size | 10 inch standard (fits 2.5" x 10" cartridges) |
| Port Size | 3/4 inch NPT inlet and 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 |
| Pressure Relief | Non-pressure relief valve style |
INSTALLATION & USE
Installing the Flowmatic FH4200BB34
- Install housing on inlet side of your water system using 3/4 inch NPT fittings, ensuring flow direction matches housing markings if indicated
- Insert your choice of 2.5" x 10" filter cartridge into the sump, seat the cap O-ring properly in the groove, and hand-tighten the black cap using the buttress threads
- Pressurize the system slowly and check all connection points and the cap seal for leaks before putting into regular service
- Replace filter cartridges according to manufacturer recommendations or when flow rate diminishes noticeably, typically every 3 to 6 months depending on water quality
COMPATIBILITY
Cartridge and System Compatibility
The Watts FH4200BB34 accepts all standard 2.5 inch diameter by 10 inch length filter cartridges, including sediment, carbon block, pleated polyester, and specialty media cartridges from Watts, Pentek, Culligan, and other major manufacturers. The 3/4 inch NPT ports integrate directly with residential plumbing and are compatible with most whole-house, point-of-use, and light commercial filtration systems operating within the 100 psi maximum pressure rating.
🔧 Pro tip: Before installing a new cartridge, lubricate all three O-rings (cap, sump, and top seat) with a thin layer of food-grade silicone grease to ensure proper sealing and make future housing openings easier.
