20″ Big Blue Water Filter Housing – Single O Ring
R579.60
20″ Big Blue and Big Black Heavy Duty Filter Housings offer the versatility to meet all of your large-capacity filtration needs, including high-flow and heavy-sediment applications. The extra-large housing allows for greater cartridge capacity, reducing the number of vessels required for high flow-rate applications.
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20″ Big Blue Water Filter Housing – Taiwan (Single O-Ring)
The 20″ Big Blue Water Filter Housing – Taiwan is a durable, high-capacity housing designed for residential, commercial, and pre-RO filtration systems. Additionally, it features a single O-ring for reliable sealing, ensuring leak-free performance. It accommodates standard 20″ × 4.5″ filter cartridges, making it ideal for sediment removal, carbon filtration, or whole-house water treatment. Moreover, its Taiwan-manufactured construction guarantees long-term stability even in demanding water conditions.
Key Features
- Single O-Ring Seal: Ensures a tight, leak-free connection while allowing easy maintenance.
- Fits 20″ × 4.5″ Cartridges: Accepts sediment, carbon block, CTO, GAC, and specialty filters.
- High-Capacity Housing: Perfect for whole-house and high-flow filtration setups.
- Taiwan Quality Build: Strong polypropylene body designed for durability and pressure stability.
- Easy Servicing: Compatible with standard Big Blue wrenches, brackets, and cartridges. In addition, replacement cartridges are widely available.
Technical Specifications
- Housing Type: 20″ Big Blue (single O-ring)
- Cartridge Size: 20″ × 4.5″
- Material: Heavy-duty polypropylene
- Port Size: Typically 1″ (confirm your model)
- Operating Pressure: Up to approx. 6 bar
- Temperature Range: ~4°C – 38°C
Benefits for Your Filtration System
This Taiwan-made Big Blue housing provides large filtration capacity and improved water flow, making it suitable for borehole systems, municipal water polishing, or pre-filtration for reverse osmosis. Furthermore, the single O-ring design ensures easy sealing without over-tightening. Consequently, it reduces leaks and maintenance hassles, while the large internal diameter allows high flow with minimal pressure drop.
Installation & Maintenance Tips
- Mount vertically with enough clearance to remove the sump during cartridge replacement.
- Always depressurise the system before opening the housing.
- Additionally, lubricate the O-ring with food-grade silicone before re-installing.
- Replace filters based on water quality (typically every 6–12 months).
- Finally, check for leaks after re-pressurising the system.


Shipping and Delivery
Monster Mechanical delivers nationwide across South Africa. Orders are processed once payment is confirmed, and dispatch timing depends on product type, stock availability and whether your system is built to order.
Delivery Information
- In-stock components and smaller items are usually dispatched within 1–3 business days.
- Larger RO systems, custom assemblies and project orders may require additional build or handling time before dispatch.
- Delivery times vary by destination and courier service, with major centres typically faster than regional or outlying areas.
For bulky equipment, installation-related deliveries or urgent requirements, please contact our team before ordering so we can confirm lead times, freight options and the best delivery solution for your location.



