--- product_id: 16317419 title: "Waterway Plastics 3721621-1D" brand: "waterway" price: "€ 1187.22" currency: EUR in_stock: true reviews_count: 12 category: "Waterway" url: https://www.desertcart.de/products/16317419-waterway-plastics-3721621-1d store_origin: DE region: Germany --- # 4HP powerful motor Rotates every 90Β° Viton shaft seals Waterway Plastics 3721621-1D **Brand:** waterway **Price:** € 1187.22 **Availability:** βœ… In Stock ## Summary > πŸ’§ Power, precision, and peace of mind in every pump! ## Quick Answers - **What is this?** Waterway Plastics 3721621-1D by waterway - **How much does it cost?** € 1187.22 with free shipping - **Is it available?** Yes, in stock and ready to ship - **Where can I buy it?** [www.desertcart.de](https://www.desertcart.de/products/16317419-waterway-plastics-3721621-1d) ## Best For - waterway enthusiasts ## Why This Product - Trusted waterway brand quality - Free international shipping included - Worldwide delivery with tracking - 15-day hassle-free returns ## Key Features - β€’ **Built to Last:** Durable Viton shaft seals ensure leak-resistant, long-lasting performance. - β€’ **360Β° Versatility:** Easily rotate the wet end every 90Β° for perfect installation flexibility. - β€’ **DIY Friendly Upgrade:** Simple installation saves you hundreds on service callsβ€”join the savvy pros who fix it themselves. - β€’ **High Flow Performance:** Delivers an impressive 160 gallons per minute to keep your spa or pool perfectly circulated. - β€’ **Power Meets Efficiency:** Robust 4HP 56-frame motor runs cooler and stronger for extended life. ## Overview The Waterway Plastics 3721621-1D is a high-performance 4HP, 2-speed wet end pump designed for above-ground pools and spas. Featuring a rotatable wet end every 90 degrees, Viton shaft seals for durability, and a 56-frame motor that runs cooler for longer life, it delivers a strong 160 GPM flow rate. Ideal for DIY enthusiasts seeking reliable, quiet, and efficient water circulation with easy installation. ## Description WTRWY 3721621-1D EXECUTIVE 4HP 2SP 2"X2" 230V 56FR SD Review: Excellent, quiet pump - I have always been a little skeptical about changing my pump on my hot tub, however now that we are retired it is nice to save some money, and I have the time to do this myself. The last time I had the pump replaced they charged me $960, and that was six years ago, so I know it would likely cost over $1,000 now. This was the same brand pump they used, so I ordered it here on desertcart. I watched a couple of videos on replacing hot tub pumps and then went to work on this. I took my time and found the process was actually quite easy. The most difficult part was finagling the pump out of the cabinet, but it just took some patience. It just took a bit of time, a couple swear words, and I must say I think I did a much better job than the company that had installed it six years ago. They had not put on the floor bolts, and left old parts and towels in the floor of the hot tub. It is much quieter now, likely since I tightened the pump down tight. Apparently, they did not want to spend the time as it was hard getting the correct wrench in there to tighten the bolts down. It cost me less than a third of what I would pay to have a service man to do it, and did a much better job myself. I now will do other repairs and just take my time doing it. There are so many great videos online to make the job fairly easy. Review: Solid replacement. - The first pump I received came in a messed up box- the housing was dented, the floor plate was bent, and the electrical cap looked like it was dragged on the road. I used the desertcart app for a return, and it asked if I wanted a replacement, I said yes. I had a new pump in a perfect box delivered four days later. This pump was in brand new condition, and although the floor plate was smaller, I was able to make it work. Electrical lined up perfectly. It probably took me an hour. Make sure you take a pic of existing wiring just in case and finger tight the connections. Highly recommend at this point...and I will update if it stops working ;). ## Features - Highly versatile wet end can be rotated every 90 Degrees - Viton Shaft Seals - 56-frame motor for added strength, cooler operating temperature and longer motor life - 160 Gallons Per Minute flow rate ## Technical Specifications | Specification | Value | |---------------|-------| | ASIN | B004VTH8R4 | | Best Sellers Rank | #319,598 in Patio, Lawn & Garden ( See Top 100 in Patio, Lawn & Garden ) #9,471 in Pool & Spa Replacement Parts | | Brand | Waterway | | Brand Name | Waterway | | Customer Reviews | 4.2 out of 5 stars 508 Reviews | | Flow Rate | 160 gpm | | Horsepower | 4 hp | | Included Components | Include: 1 x Waterway Executive 4HP 2SP 2"X2" 230V 56FR SD | | Item Dimensions L x W x H | 15.78"L x 8.05"W x 9.08"H | | Item Type Name | EXECUTIVE 4HP 2SP 2"X2" 230V 56FR SD | | Manufacturer | Waterway Plastics | | Manufacturer Part Number | 3721621-1D | | Material | Plastic | | Material Type | Plastic | | Maximum Flow Rate | 160 gpm | | Model Number | 3721621-1D | | Number of Items | 1 | | Power Source | Electrical | | Product Dimensions | 15.78"L x 8.05"W x 9.08"H | | Product Style | Above Ground | | Style | Above Ground | | Unit Count | 683.2 Ounce | | Voltage | 240 volts | ## Product Details - **Brand:** Waterway Plastics - **Material:** Plastic - **Product Dimensions:** 15.78"L x 8.05"W x 9.08"H - **Power Source:** Electrical - **Maximum Flow Rate:** 160 Gallons Per Minute - **Voltage:** 240 Volts - **Manufacturer:** Waterway Plastics ## Images ![Waterway Plastics 3721621-1D - Image 1](https://m.media-amazon.com/images/I/61bMde5wzyL.jpg) ## Customer Reviews ### ⭐⭐⭐⭐⭐ Excellent, quiet pump *by J***E on April 23, 2025* I have always been a little skeptical about changing my pump on my hot tub, however now that we are retired it is nice to save some money, and I have the time to do this myself. The last time I had the pump replaced they charged me $960, and that was six years ago, so I know it would likely cost over $1,000 now. This was the same brand pump they used, so I ordered it here on Amazon. I watched a couple of videos on replacing hot tub pumps and then went to work on this. I took my time and found the process was actually quite easy. The most difficult part was finagling the pump out of the cabinet, but it just took some patience. It just took a bit of time, a couple swear words, and I must say I think I did a much better job than the company that had installed it six years ago. They had not put on the floor bolts, and left old parts and towels in the floor of the hot tub. It is much quieter now, likely since I tightened the pump down tight. Apparently, they did not want to spend the time as it was hard getting the correct wrench in there to tighten the bolts down. It cost me less than a third of what I would pay to have a service man to do it, and did a much better job myself. I now will do other repairs and just take my time doing it. There are so many great videos online to make the job fairly easy. ### ⭐⭐⭐⭐⭐ Solid replacement. *by D***Y on July 2, 2021* The first pump I received came in a messed up box- the housing was dented, the floor plate was bent, and the electrical cap looked like it was dragged on the road. I used the Amazon app for a return, and it asked if I wanted a replacement, I said yes. I had a new pump in a perfect box delivered four days later. This pump was in brand new condition, and although the floor plate was smaller, I was able to make it work. Electrical lined up perfectly. It probably took me an hour. Make sure you take a pic of existing wiring just in case and finger tight the connections. Highly recommend at this point...and I will update if it stops working ;). ### ⭐⭐⭐⭐⭐ Nice pump and runs very quietly! Definitely surprised. *by A***I on March 28, 2022* So I was very skeptical about ordering a hot tub pump from Amazon but after doing some research I gave it a shot. Remember with pumps, you cannot go by HP you have to go buy the amperage rating that's on your current pump, so for instance this one was a 12/4.4 and if you use a calculator it will help you match it up. Also make sure you get the correct frame (48 and 56). Anyways, I didn't know anything about hot tub pumps until I did some research. This thing runs really quietly (though it's a tad less powerful than my old circulation pump) but it does the job and was a lot cheaper than the alternatives I found online. Plus I enjoy buying with Amazon. Def happy with it so far but let's see how long it lasts. --- ## Why Shop on Desertcart? - πŸ›’ **Trusted by 1.3+ Million Shoppers** β€” Serving international shoppers since 2016 - 🌍 **Shop Globally** β€” Access 737+ million products across 21 categories - πŸ’° **No Hidden Fees** β€” All customs, duties, and taxes included in the price - πŸ”„ **15-Day Free Returns** β€” Hassle-free returns (30 days for PRO members) - πŸ”’ **Secure Payments** β€” Trusted payment options with buyer protection - ⭐ **TrustPilot Rated 4.5/5** β€” Based on 8,000+ happy customer reviews **Shop now:** [https://www.desertcart.de/products/16317419-waterway-plastics-3721621-1d](https://www.desertcart.de/products/16317419-waterway-plastics-3721621-1d) --- *Product available on Desertcart Germany* *Store origin: DE* *Last updated: 2026-08-24*