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A third common type of wrench utilizes a metal or plastic cup that is shaped much like a socket. The cup is placed on the end of the filter, which engages the knurling. A socket or wrench is then used to loosen the filter.
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Another type uses a metal band that is attached at both ends to a handle. The looped band is placed around the filter and the handle is turned anticlockwise, which puts tension on the band, causing it to grip the filter.
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One common type of wrench is shown on the right. The loop of chain is placed around the filter, and the bar is turned anticlockwise by hand until the chain wraps itself tightly around the filter. A
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is then used to turn the hexagonal bar further in the same direction. This increases the tension in the chain, which bites into the soft metal casing of the oil filter which helps prevent slippage.
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Chain-type oil-filter wrench. The chain is wrapped around a spin-on oil filter, and the hexagonal bar is turned anticlockwise to grip and unscrew the filter.
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Finally, a "claw" type of wrench, manufactured by Sykes-Pickavant and others, has three geared metal prongs and accommodates a (typically)
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cars require this type of wrench to remove their filters (or the lid of the filter housing, where a non-cartridge filter is used).
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Socket-type oil-filter wrench. It fits over the end of the filter and is turned with a ratchet. It is made of stamped steel.
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has designed their oil filters so that removal and installation can be done with a
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on the bottom that are difficult to grip, especially when they are oily.
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Strap-type oil-filter wrench. This one has a handle built in.
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Strap-type oil-filter wrench. A ratchet is used to turn it.
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These filters are smooth, cylindrical canisters with
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96:August 2018
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