Smith NL403 Backpack Sprayer Review

Smith NL403 Backpack Sprayer No-Leak

The Smith NL403 No-Leak Backpack Sprayer for Pest Control is built for professionals focussing on chemical resistance and operating in the most demanding work conditions. This backpack sprayer is built to very high standards with more than 3 times the cycle life between failures compared to the competition. If you are a pest control professional looking for a quality backpack sprayer that will stand up to whatever work you throw at it, this is the one.

Smith NL403 backpack sprayer stainless steel wand


By the time we got our hands on this sprayer, we had virtually gone through all of its brothers. For those of you that don’t know, Smith Performance Sprayers are made by the same manufacturer as Roundup and Field King. That is why many of their sprayers have similar features. Some of the pieces are even compatible with different sprayers regardless of the brand name.

Why are there so many version of these sprayers? If one company makes them why do they vary in price so much?

The issue is that most of these sprayers actually work great so sometimes it's hard to decide whether to go with the $60 Roundup Backpack Sprayer or the $200 Smith Performance Sprayer.

It comes down to how you're planning to use the backpack sprayer. That inexpensive Roundup backpack sprayer is fine for spraying some herbicide around the yard. On the other hand, if you rely on a backpack sprayer every day on the job, you may want to invest in a professional level backpack sprayer like the Smith NL403 Backpack Sprayer.

In this case, we tested out the Smith NL403 No-Leak Backpack Sprayer for Pest Control. Like many of these sprayers, it comes with a 4-gallon tank. Also, it shares the system that allows you to take the tank apart without the use of tools for quick fixes on the fly.

Another feature that has been made widely popular thanks to Smith Performance sprayers is the high-performance diaphragm pump. This high-powered pump can reach up to 150 psi.

What to do with all of that power? Just about anything considering it also includes a versatile and innovative 4-way multi-jet nozzle! The stream emitted from the nozzle can reach up to 30 feet, impressive.

Many of these features you may recognize from the Smith NL401 backpack sprayer while there are a few unique features as well. The Smith NL401 sprayer is for cleaning and mold remediation while this Smith NL403 sprayer is built for pest control and features a unique 4-way multi-jet nozzle to help you reach into the tightest crevices.

Smith NL403 Features

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    4 Gallon tank with an oversized opening for easy filling
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    Exclusive, internal No Leak Pump with Viton seals never leaves harsh chemicals
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    Deluxe shoulder harness with storage area for nozzles and back support cushion
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    21-inch stainless steel wand and tank frame for durability
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    5 PSI drip proof check valve with integrated filter - no more dripping when you aren't spraying
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    Achieves 65% higher pressure than leading diaphragm pump backpacks
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    The built-in agitator can handle liquids, powders, and water-soluble solutions
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    The 4-Way nozzle includes Fine Fan, Coarse Fan, Pin, and Crack & Crevice

What are people saying?

Just about everyone agrees that the Smith NL403 is an excellent, professional level backpack sprayer. Most people we've talked to say the Smith Performance Sprayer line is their go-to for quality and performance.

What we liked

The Smith NL401 backpack sprayer performed beautifully. This backpack sprayer is just a quality tool any way you look at it.

Just like its Smith Performance Sprayer NL401 counterpart the diaphragm pump gives it 150 psi of power. We like the fact that you have to pump less to be able to spray efficiently.

The 4 in 1 nozzle is also a very cool feature. You don’t have to worry about switching everything off when you want to change the nozzle. You can do all of those things on the fly which allows you to do the job quicker.

The weight and feel of the sprayer are also a little bit lighter than we anticipated so this is also a plus. The deluxe padded shoulder straps and back padding also help to make the weight more comfortable.

What we didn't like

If you're looking for a general purpose backpack sprayer for around the yard, the Smith NL403 backpack sprayer might be more than you need, which makes it an expensive option. If this sounds like you, take a look at the Roundup 190314 backpack sprayer.


The Smith NL403 No-Leak Backpack Sprayer for Pest Control is a fantastic sprayer. If you are a professional and rely on high-quality tools to do your job or even a weekend warrior that prefers to buy the best tool for the job and keep it for years, buy this now and you won't regret it.

I give it 4.5 stars!

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