


Sealey Straight Coupling 12mm Pack 5 (John Guest Speedfit® JGCS12
Marsoni
M251S
Get it in 3 business days with 1 day shipping.
Friday, May 29
Sealey Straight Coupling 12mm Pack 5 (John Guest Speedfit® JGCS12Speedfit pneumatic couplings, straight couplings supplied in sizes 6, 8,10 and 12mm. Material specifications; bodies are produced in an acetal copolymer engineering plastic, especially suitable for pneumatics and corrosion free applications; O rings are nitrile rubber; collets are produced in acetal copolymer with stainless steel teeth. One of a comprehensive range of high quality components for the John Guest Speedfit Pneumatic Coupling System.
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- Express: 1-2 business days
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- Final sale items are not eligible for returns or exchanges.
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★★★★★ 5
Pattern and roughness appropriate but still need to test
I haven't had a flat tire yet, so I also haven't had occasion to test these but they seem like great value for an extremely low price (especially versus a new tire.) I have handled them to try and gauge how quickly they'd smooth a hole, and they're rough / sharp and aggressive enough that I expect them to work quickly and well on not only tires, but on a variety of other materials. This pattern in particular should allow material to be shed and then passed backward pretty easily without clogging things up or slowing them down. If you've bothered to buy a patch kit for your tires, you really ought to have one of these around.
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Reviewed in the United States on January 18, 2026
★★★★★ 5
Thank you!
Size: 1/4-Inch - With Adapter
Thank you!
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Reviewed in the United States on April 27, 2023
★★★★★ 5
Makes plugging easy
Size: 1/4-Inch - With Adapter
Screw that T handle punch tool!!
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Reviewed in the United States on April 4, 2021
★★★★★ 5
as advertised
As advertised
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Reviewed in the United States on June 2, 2026
★★★★★ 5
Great value, easy to use, and do a great job.
Great for tire repair! It fits in any drill in a snap, so you are able to ream the hole out in a tire so you can patch and repair the tire. My shop used these all the time, and never had any issues with them. They hold up well, and do the trick for just about any size hole in a tire. Great buy!
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Reviewed in the United States on January 27, 2026