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Mechanical Back Pressure Regulator, 290 psi max permanent supply pressure, 15-290 psi pressure range

Marsoni M251S
Sale price$1570.00
Pay 4 payments of $392.50 a month.Shop Pay
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Mechanical Back Pressure Regulator, 290 psi max permanent supply pressure, 15-290 psi pressure rangeLimits the supply pressure to a set value by opening an outlet and guiding back excess material when the predetermined pressure has been achieved. Used in circulating systems. UPC Product: 00633955858527 Family Code: FAMCNV Unit of Measure: EA Height: 6 IN 15. 24 CM Length: 10. 8 IN 27. 432 CM Width: 9. 6 IN 24. 384 CM Volume: . 36 FT3 . 01 M3 Chargeable Weight: 4. 17 LBS 1. 89 KG Technical Specifications Gauge Port Size (cm) 0. 3175 Gauge Port Size
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4.6 ★★★★★
Based on 758 reviews
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J
Verified Purchase
Joe H.
Natrona Heights, US
★★★★★ 5
Very Expensive
Had one cylinder misfiring so replaced coil and spark plug. Runs fine now, but old plug looked shot after only 5 months so I think the coil was the problem. Really good plug so far but very expensive.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on February 12, 2026
R
Verified Purchase
rkab8745
Louisville, US
★★★★★ 5
A reliable set of spark plugs.
They’re made in Germany, what else can you say
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 24, 2026
A
Verified Purchase
Amazon Customer
Phoenix, US
★★★★★ 5
Work as well as the NGK's
Bought for a 2016 Mazda 6, I had NGK's in it for 5 months and had misfires, didnt have the money to throw more NGK's at it for troubleshooting. Bought these to try and they work great so far.
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Reviewed in the United States on April 29, 2026
C
Verified Purchase
Christopher D. Bodirsky
Lake Worth, US
★★★★★ 4
Faulty plug? Otherwise great set
Definitely better than the old plugs that probably had 80k miles on them. The one star off is because I had a misfire after installing. Not sure if I damaged the plug or what, but a reinstall didn't fix the misfire. In my genius, I rushed to try to gap it and ended up breaking the iridium tip. Put the old plug into cylinder 3 (where the misfire was) and it was fine. Gonna have to get a new single tomorrow at my local shop, but a bit frustrating to get a misfire after install.
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Reviewed in the United States on April 27, 2026
B
Verified Purchase
Britincali
Natrona Heights, US
★★★★★ 5
Upgrade from OEM
After seeing a quite ludicrous $403 quote to change 4 spark plugs in a Mazda3 I decided to show my son how easy it is. These were an upgrade from OEM parts. They were gapped perfectly for the car. They took 20mins to fit and work fine.
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Reviewed in the United States on February 11, 2026

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