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3541DHS CAT Triplex Positive Displacement Plunger Pump 45 GPM / 170 LPM 1000 PSI 765 RPM 316 Stainless Steel 1 1/2
3541DHS CAT Triplex Positive Displacement Plunger Pump 45 GPM / 170 LPM 1000 PSI 765 RPM 316 Stainless Steel 1 1/2
3541DHS CAT Triplex Positive Displacement Plunger Pump 45 GPM / 170 LPM 1000 PSI 765 RPM 316 Stainless Steel 1 1/2
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3541DHS CAT Triplex Positive Displacement Plunger Pump 45 GPM / 170 LPM 1000 PSI 765 RPM 316 Stainless Steel 1 1/2" NPT(F) Inlet Port Size 1" NPT(F) Discharge Port Size Belt, Flexible Coupling and Bellhousing Drive Type(s)

Marsoni M251S
Sale price$7149.99
Pay 4 payments of $1787.50 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
3541DHS CAT Triplex Positive Displacement Plunger Pump 45 GPM / 170 LPM 1000 PSI 765 RPM 316 Stainless Steel 1 1/2" NPT(F) Inlet Port Size 1" NPT(F) Discharge Port Size Belt, Flexible Coupling and Bellhousing Drive Type(s)3541DHS CAT Triplex Positive Displacement Plunger Pump 45 GPM 170 LPM 1000 PSI 765 RPM 316 Stainless Steel 1 1 2" NPT(F) Inlet Port Size 1" NPT(F) Discharge Port Size Belt, Flexible Coupling and Bellhousing Drive Type(s) Desalination SWRO (Seawater Reverse Osmosis): This is the primary application for this model. The Duplex Stainless Steel discharge manifold is specifically required to resist the high corrosion of saltwater at high pressures.
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Your 3541DHS CAT Triplex Positive Displacement Plunger Pump 45 GPM / 170 LPM 1000 PSI 765 RPM 316 Stainless Steel 1 1/2" NPT(F) Inlet Port Size 1" NPT(F) Discharge Port Size Belt, Flexible Coupling and Bellhousing Drive Type(s) orders ship within 1-2 business days.

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Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
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4.9 ★★★★★
Based on 1073 reviews
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Product Reviews
W
Verified Purchase
WN
Charlottesville, US
★★★★★ 5
Been doing great since 2020
Used this to replace the charging solenoid on my diesel motorhome. Originally used a White-Rodgers OEM relay and it only lasted about 18 months. This has been going strong since 2020 and I use my motorhome about 10 months out of the year with lots of miles.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on October 2, 2024
J
Verified Purchase
Jason Vorbeck
Waukegan, US
★★★★★ 1
Buy something better
This relay has experienced failure again after just a couple of months of use. It's not the mag coil that fails but rather the contacts are of such low quality that they corrode beyond their ability to conduct power, and fast. I have had to change two of these so far and am on the third one. The seller will ship replacements but who wants to keep replacing them? I have to travel in my RV with a spare. This relay has never been exposed to the elements. It's safely mounted inside a sealed bay. Be aware of any brands that look like this, they are all the same.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on November 15, 2025
D
Verified Purchase
Dave Kulina
Birmingham, US
★★★★★ 5
Works great
I added extra batteries to run a truck camper without killing my main battery and this works great. Simple to install and i have no had any problems in the pay few months and i use it every single day
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 18, 2021
A
Verified Purchase
Amazon Customer
Whiting, US
★★★★★ 5
Installed in my RV.
This product works well. It is somewhat difficult to mount. The contact points are a little too close together. These deficiencies are understandable given its low cost and small size.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on January 18, 2021
B
Verified Purchase
Bret Jackson
Lowell, US
★★★★★ 5
Best main wire for price
Size: 25 FT, Style: 0 (1/0) AWG RED
Good main wire and is accurate size and length
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 18, 2026

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