Barens Pressure Washer Pump 3500

SKU: CAT-5CP3120

$1,016.00 $1,168.00

You Save: $152.00 14%

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4.5 GPM, 3500 PSI Belt-Driven Triplex Plunger Pressure Washer Pump – 20mm Shaft, Rebuildable

This professional-grade belt-driven triplex plunger pump is engineered for durability, smooth operation, and reliable performance in high-demand pressure washing environments. Designed as a direct replacement for worn-out pumps, it’s pre-plumbed, pre-tested, and compatible with most 3/4" gas engine face plates using a standard 4-bolt mount.

Whether you're upgrading or rebuilding, this pump is a cost-effective solution offering long service life with its ceramic plungers and rebuildable design. Shaft protector and mounting rails are sold separately.

Key Features:

Powerful Performance – Delivers 4.5 GPM at 3500 PSI, perfect for heavy-duty pressure washer systems.
Versatile Compatibility – Fits most 3/4" gas engine flanges; solid 20mm shaft runs at 1645 RPM.
Belt-Drive Design – Reduces wear and tear for a longer service life and quieter operation.
Triplex Ceramic Plungers – Provide even wear, increased durability, and smooth fluid flow.
Rebuildable Construction – Designed for cost-effective maintenance and extended pump lifespan.
Durable Build Quality – Ideal for use with both electric (11 HP) and gas engines (15 HP); supports engines up to 14 HP.
Max Water Temperature: 160°F

Technical Specifications:

Flow Rate: 4.5 GPM
Max Pressure: 3500 PSI
Shaft Diameter: 20mm Solid Shaft
Pump Speed: 1645 RPM
Bore Diameter: 16mm (0.630")
Stroke Length: 18mm (0.709")
Fuel Type Compatibility: Electric or Gas
Mounting: Fits 4-bolt engine face plates (bolts not included; reuse old hardware)
Temperature Rating: Up to 160°F
Horsepower Requirement: 11 HP (electric), 15 HP (gas)

Important Notes:

Unloader & Injector Not Included – Adjustable pressure unloader and chemical injector must be purchased separately.
- Compatible Parts: Chemical Injector (ACI005) and Unloader Kit (302)
Shaft Protector & Mounting Rails Sold Separately
No Siphon Barb Included – Check if your setup requires one.
Measure Accurately Before Ordering – Be sure to verify shaft size and bolt hole spacing to avoid fitment issues.
Return Policy: 25% restocking fee on returned pumps.

Need Help Choosing the Right Pump?

Please contact us with the following information:

Age and model number of your current pump (must be under 15 years old)
Is the pump vertical or horizontal?
Shaft size: 3/4", 7/8" (vertical only), 1", or XXmm belt drive
Engine brand, horsepower, and model number (if available)

This pump is an ideal solution for commercial pressure washers, surface cleaners, and industrial applications where performance and longevity matter most.

Order Processing Time: We typically process orders within 1 to 2 days. Please be aware that the deadline for placing orders is 6 p.m. Orders submitted after this time will be processed the next business day. Shipping Information: Expect your order to arrive in 4 to 7 days. We offer free shipping for orders over $200. For orders below $200, a flat shipping fee of $15 applies. Please note that we currently only ship within the United States. International shipping is not available. The majority of our orders are dispatched via third-party freight carriers (18-wheelers). In case your order includes an item that requires freight shipping, we will contact you to schedule a curbside delivery. Ensure that your contact number is correct at checkout. Order Confirmation and Payment: After you place your order, a confirmation email will be sent to you. This confirms that your order is registered in our system and your credit card is authorized for the purchase. Your card will be charged only when the item is shipped. For backordered items, we might hold a charge to reserve the product for you. As soon as we receive your order, we begin processing it immediately!

We're committed to offering you the best prices available online. If you come across a lower price on another online store, let us know, and we'll not just match it — we'll beat it. We aim to give you the assurance that you're getting the best possible price for your purchase. Our Price Match Guarantee, however, comes with certain conditions: Offers like rebates, and 'buy one, get one free' deals are not included.The competing website cannot be a discount or auction platform (for example, eBay). The competing retailer must be an authorized seller of the item in question. The guarantee takes into account the total cost, including the item's price, sales tax, and shipping charges. Please note, our Price Match Guarantee does not apply to exchange orders. If you want us to match or beat a price, just call us today (

At Attachment Selection, we want to make your shopping experience worry-free, so we've simplified our returns and refunds process: Return Period: Items can be returned within 30 days of purchase. Unfortunately, we cannot accept returns after this 30-day period. Shipping Costs for Returns: If your purchase is defective or not as described, we'll cover the return shipping cost. However, if you're returning an item due to a change of mind, the shipping cost will be your responsibility. Defective or Damaged Items: If you receive a defective or damaged product, please inform us within 30 days. We'll arrange a return at no extra cost to you. After receiving and inspecting the item, we'll either replace it or refund you in full, including shipping costs. Returns Due to Change of Mind: If you change your mind about your purchase, you have 30 days to return it. Remember, you will be responsible for the return shipping cost. The item must be unused and in its original packaging. Upon receipt and inspection, we'll refund the cost of the item, excluding shipping charges. Processing Refunds: Once we receive and verify the returned item, we'll initiate a refund to your original payment method within 7 business days. Note that it might take some time for your bank or card to reflect the refund. If you don't see the refund after 10 business days, please contact us at support@athleteselection.com. Please be aware that a restocking fee may apply in certain return scenarios. For any further inquiries regarding our return or refund policy, our Customer Support team is here to help at support@athleteselection.com.

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