20 × 4.5 in Filter Housing
WP-20BB
1 in FNPT
Black housing
Cap + O-ring
Replacement Filter Housing
Selected part: WP-20BB filter housing
Compatible Glonyx systems
Match the 20 × 4.5-inch format, 1-inch FNPT ports, and mounting layout before ordering.
Product details
Specifications, Fit & What's Included
Key dimensions, system fit, and box contents at a glance—so you can choose the replacement part that matches your Glonyx setup.
Key Specifications
| Housing format | 20 × 4.5 in |
|---|---|
| Port connection | 1 in FNPT female thread |
| Color | Black |
| Included | Cap, O-ring, and pressure-release structure |
| Designed for | Compatible Glonyx 20 × 4.5 in whole-house filter assemblies |
Made to Fit
Made for compatible Glonyx whole-house filter assemblies that use the 20 × 4.5 in housing format and 1 in FNPT ports.
Quick Fit Check
Check the housing size and 1 in FNPT female ports on the assembly you are replacing.
What's Included
1 black housing assembly with cap, O-ring, and pressure-release structure.
Industry-standard 20 × 4.5 in whole-house format.
1 in FNPT female inlet and outlet ports.
Cap, O-ring, and pressure-release structure are included.
Need help matching it? Send us a photo of your housing and plumbing connection.
Compatibility & service
Match the original part before checkout
Replacement parts can look similar while using different electrical ratings, dimensions, connectors, threads, seals, or operating modes.
WP-20BB replacement filter housing
The WP-20BB 20 × 4.5-inch housing holds the matched cartridge and restores a compatible whole-house filtration stage.
What to match
- Confirm the 20 × 4.5-inch format and 1-inch FNPT female ports.
- Match pipe alignment, O-ring, bracket spacing, pressure-release structure, and service clearance.
- Blue or Black identifies color only; all listed housing specifications are the same.
Before replacement
- Follow the system shutdown instructions: disconnect power to connected equipment, shut off the water supply, and depressurize the housing.
- Inspect cap threads and the O-ring, support the plumbing, and leak-test slowly after installation.
- Restore service slowly and verify normal operation and leak-free sealing.
Not certain this is the correct part?
Send the system label, housing label, dimensions, and one plumbing photo before ordering.
Find your complete Glonyx system
Compare your system below, then confirm the 20 × 4.5-inch housing format, 1-inch FNPT ports, bracket spacing and pipe alignment.
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Replacement Filter Housing
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Product support
Frequently asked questions
1What housing format is confirmed?
The confirmed WP-20BB format is 20 × 4.5 inches with 1-inch FNPT female ports, a cap, O-ring, and pressure-release structure for GX-WP-E20T, GX-WP-S20T, GX-WP-V20T, and GX-WP-V20TC systems.
2What is the difference between Blue and Black?
Color only. Dimensions, ports, threads, cap, O-ring, and pressure-release structure are the same.
3What should I check before ordering?
Confirm the 20 × 4.5-inch format, 1-inch FNPT ports, pipe alignment, bracket spacing, and available service clearance.
4What warranty applies to replacement parts?
Separately sold Glonyx replacement parts and accessories carry a 1-year limited warranty against verified defects in materials or workmanship. Normal wear, consumable depletion, incorrect matching, and improper installation are not product defects.
5What accessories are included?
The current listing is for the housing only unless a cartridge, wrench, bracket, pressure gauge, O-ring, or connector is expressly listed.