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Your cart is empty.Revitalize your Solo sprayer with the genuine Solo 4400221-P Complete Diaphragm Sprayer Pump Assembly. This comprehensive replacement kit offers a quick and cost-effective solution to restore your sprayer to peak performance without the expense of purchasing an entirely new unit. Designed specifically for Solo models 475, 473ecs, 477SW, 478, 478-EN, 475 DLX, 473-D, and 485, this authentic replacement part ensures perfect compatibility and seamless installation. The assembly comes complete with an integrated pressure regulating valve featuring four adjustable settings (15, 30, 45, and 60 PSI), allowing you to customize the spray pressure for various applications from gentle misting to powerful spraying. This versatility makes it ideal for everything from delicate plant care to more demanding agricultural and pest control tasks. Every component needed for a complete replacement is included in this kit - all required seals, O-rings, clamp, and hardware - eliminating the hassle of sourcing individual parts. The high-quality diaphragm design ensures reliable performance and consistent pressure delivery for precise application of pesticides, herbicides, fertilizers, and other solutions. Proudly made in the USA, this genuine Solo replacement part is manufactured to the highest quality standards, guaranteeing durability and longevity. The straightforward installation process means you can quickly get back to your spraying tasks with minimal downtime. Trust Solo's 4400221-P pump assembly to breathe new life into your trusted sprayer and continue delivering the performance you depend on.
Iain
Reviewed in the United Kingdom on July 31, 2024
Great product
Neal
Reviewed in the United States on October 17, 2024
I had an issue with installation. Contacted the vendor and explained the issue which they promptly corrected.
Shane
Reviewed in the United States on December 31, 2023
OEM quality.
pj
Reviewed in the United States on November 11, 2021
Very hard to remove the old damaged unit but relatively easy to unstall this unit. New o e works like new!
Customer
Reviewed in the United States on April 1, 2021
Junk, can't get it back in sprayer, will not seat back in hole, broke it, threw the whole sprayer in the trash, . I will buy a new sprayer,but it will not be a Solo
Customer
Reviewed in Canada on September 24, 2019
Perfect
Enrique Z.
Reviewed in the United States on March 27, 2018
Yes, this is a very good pump.Works better then when it was new.
Chris
Reviewed in the United States on April 24, 2017
I was able to remove and re-install this new unit which did work like new. With that said, IT IS VERY VERY difficult to remove and VERY difficult to install. I had a hard time with it and probably would not go through it again. I am a handy person. I would opt to just replace the guts and not remove the diaphragm in the future.
Bhagwan
Reviewed in the United States on July 19, 2015
Just fine. Not the easiest to remove, but after a couple of whacks with a 4lb sledge & a 2X4, it's done. Much easier to re-install the new one tho. After that, it works great, & I essentially have a new sprayer for less than half the cost of a new one.
Matthew Lindsey
Reviewed in the United States on May 21, 2013
I bought this as my sprayer stopped being able to hold pressure, in the future i would just replace the pressure adjuster, as to replace this i had to beat the old one out with a 3 lb sledge hammer. That is what the instructions were to remove it.
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