Solid Backup Ring 5.500" x 5.875" x 0.055" - Polyurethane

Marsoni

M251S

$10.39

Get it in 3 business days with 1 day shipping. Friday, May 29

Solid Backup Ring 5.500" x 5.875" x 0.055" - PolyurethaneProduct Details : Solid Backup Ring 5. 500" x 5. 875" x 0. 055" Polyurethane Part No: 8 357 U Product Category: O Rings Product Type: Solid Backup Ring Series: XXX U Dash No.: 357 Material(s): Polyurethane Material Code: AU Durometer: 95A Temperature Range: 60F to +250F ( 51C to +121C) Surface Speed: < 1. 6 ft s (0. 5 m s) System Of Measurement: Inch Dimensions: 5. 500" x 5. 875" x 0. 055" Nominal I. D.: 5. 500" Nominal O. D.: 5. 875" Nominal Width

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We offer a 30-day return/exchange service after receiving.
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These mats should work fine for my application. I’m applying it to the back sides of the hollow core doors on the closet where my HVAC is installed to reduce the “hum” from passing through. If I were sound deadening my automobile, I would probably use a heavier gage material. Overall, good product at a reasonable price.

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Reviewed in the United States on March 21, 2026

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vivian johnson

Belleville, US

★★★★★ 5

Very good product

Style: 36 Sqft 80 mil

Easy to install, very sticky. Will buy again.

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Reviewed in the United States on May 20, 2026

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Samantha

Birmingham, US

★★★★★ 5

Works well and doesn’t break the bank

Style: 36 Sqft 80 mil

Awesome value for low budget wound deadening. Used this under the floor mat on my international 4300 and there is a noticeable difference in sound inside the cab.

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Reviewed in the United States on May 5, 2026

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Miguel Rojas

West Palm Beach, US

★★★★★ 5

It works

Style: 36 Sqft 80 mil

Great product

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Reviewed in the United States on May 9, 2026

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