20″ Big Blue Filter Housing Spanner (4.5″ Diameter Housing Wrench)

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Overview

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The 20” Big Blue Filter Housing Spanner is a must-have tool for anyone using large water filter housings. This 20” Big Blue Filter Housing Spanner allows you to tighten and loosen housings quickly without damaging them, making maintenance faster and safer.

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Made from durable, heavy-duty plastic, this spanner ensures a secure grip and long-lasting performance. It helps prevent leaks and makes cartridge replacement effortless.

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With its ergonomic design, the handle provides better leverage and comfort during use. Whether you’re maintaining a home water filtration system or managing an industrial setup, the 20” Big Blue Filter Housing Spanner delivers convenience and reliability.

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Always make sure to match the correct spanner size with your filter housing. Using the proper 20” Big Blue Filter Housing Spanner not only extends the life of your equipment but also keeps your filtration system working efficiently.

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Key Features of the 20” Big Blue Filter Housing Spanner

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• Fits 20” Big Blue filter housings perfectly.

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• Made from strong, high-quality plastic for long use.

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• Prevents housing damage during maintenance.

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• Designed for easy grip and quick filter changes.

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• Ideal for both domestic and commercial systems.

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Benefits of the 20” Big Blue Filter Housing Spanner

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• Faster maintenance: Quickly open and close housings with minimal effort.

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• Protects equipment: Reduces risk of cracks or leaks during service.

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• Durable design: Strong plastic construction for long-term reliability.

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• Versatile use: Works in home and industrial water systems.

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Specifications of the 20” Big Blue Filter Housing Spanner

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• Fits: 20″ length, 4.5″ cartridge diameter, “Big Blue” style housings

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• Use: Opening/closing filter housing bowls during cartridge replacement or system maintenance

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• Material: Varies (plastic or zinc-plated steel, depending on model)

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• Ideal for: Whole-house filter systems, water treatment setups, service technicians

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Use Cases of the 20” Big Blue Filter Housing Spanner

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• DIY home filtration system owners servicing their whole-house filter system.

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• Water treatment companies, plumbers or service techs who replace filter cartridges frequently.

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• Bottling plants, commercial filtration systems or any setup using 20″ Big Blue housings that see regular maintenance.

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Installation & Maintenance Tips of the 20” Big Blue Filter Housing Spanner

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• Before loosening the housing, turn off water supply and relieve pressure (open a downstream faucet).

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• Use the spanner to apply a steady, even force — avoid jerking or twisting violently.

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• After replacing the cartridge or performing the service, ensure the O-ring is clean, lightly greased (food grade silicone grease) and seated correctly before re-tightening the bowl.

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• Periodically check the tool itself — if using a plastic wrench and it shows wear, upgrade to a metal version to avoid breaking during use.

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• Store in a dry area; if using the metal version, keep it free from rust and debris to maintain grip.

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Why Choose Puritech

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At Puritech, we specialise in high-quality water filtration accessories. This spanner is part of our commitment to helping you maintain your system efficiently and reliably. With local support, fast delivery in South Africa, and trusted tools, we ensure you’re equipped for the job.

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FAQ

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Q: Will this spanner fit my filter housing?
A: It fits “Big Blue” style housings that hold 4.5″ diameter cartridges and are 20″ in length. If your housing is 10″ length or uses a different diameter cartridge, you might need a different size. All Filters
Q: Is this suitable for commercial use?
A: Yes — the tool is designed for whole-house and commercial filter housings of the 20″ Big Blue format, so it’s suitable for higher-volume systems too.
Q: How tight should the housing bowl be after servicing?
A: Tighten until the O-ring sits flush and you feel firm resistance; do not overtighten with sheer force — the spanner should allow you to get it sufficiently sealed without risking stress on the threads.
Q: What if the housing is stuck and won’t turn?
A: Make sure you’ve depressed the pressure relief on the housing, turned off water supply, and used the correct size spanner. If it’s still stuck, using a metal wrench version helps because it offers greater leverage.