SKU: 28683001541

PHOTOCELL 120V - K4221

$19.58 $21.76
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Ships within 48 hours · Estimated delivery Sep 1 - Sep 6

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Description

PHOTOCELL 120V - K4221The K4221 120V Photocell Thermal Control delivers reliable automatic lighting control for pool contractors managing commercial and residential outdoor lighting systems. This stem and swivel mount photocontrol provides professional grade dusk to dawn operation with advanced delay features that prevent false switching from transient light sources. Commercial Pool Lighting Benefits Designed for demanding outdoor environments, this thermal photocontrol

The K4221 120V Photocell Thermal Control delivers reliable automatic lighting control for pool contractors managing commercial and residential outdoor lighting systems. This stem and swivel mount photocontrol provides professional-grade dusk-to-dawn operation with advanced delay features that prevent false switching from transient light sources.

Commercial Pool Lighting Benefits

Designed for demanding outdoor environments, this thermal photocontrol reduces maintenance calls with its weather-resistant polycarbonate housing and sonic-welded moisture seal. The mechanical bimetal switch with cadmium sulfide photocell ensures consistent performance across temperature ranges from -40°F to 158°F, making it ideal for year-round pool installations.

Why Pool Contractors Choose MT Pools

MT Pools provides superior customer service and wholesale pricing that supports your profit margins on lighting automation projects. Our daily recurring customer support ensures you have the technical expertise and reliable inventory to keep your pool lighting installations on schedule and profitable.

Frequently Asked Questions

What lighting types are compatible with the K4221 photocell?

The K4221 is compatible with fluorescent, HID, and incandescent lighting systems, handling up to 15A incandescent loads and 8.3A/1000VA magnetic ballast loads.

How does the delay feature prevent false switching?

The 30-90 second sensor delay prevents unwanted switching from car headlights, lightning, or other transient light sources, ensuring reliable dusk-to-dawn operation.

Is installation flexible for different fixture types?

Yes, the swivel arm design allows flexible installation to standard outdoor fixtures or electrical boxes with 1/2"-14 NPSM threaded stem and included mounting hardware.

What certifications does this photocontrol have?

The K4221 is UL and cCSAus certified with Green Energy and Title 20 compliance, meeting professional installation requirements for commercial pool projects.

Order Today

Trust MT Pools for your pool lighting automation needs. Our expert team provides technical support and fast shipping to keep your projects profitable and on schedule.

Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 28683001541

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4.6 ★★★★★
Based on 11 reviews
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Verified Purchase
Guadalupe arauz
Birmingham, US
★★★★★ 5
Practical and elegant grinder for daily use
Color: Silver single
I bought this manual salt and pepper grinder and in general I thought it was a very good option for the kitchen. The design is elegant and the glass body allows you to easily see when it is time to refill it. In addition, the stainless steel lid helps keep the spices fresh and prevents residues from falling on the table. The ceramic blades grind both coarse salt and pepper well, and I liked that the thickness can be adjusted according to what you need, from a fine grind to a thicker one. It is also easy to recharge and clean. After several uses it works properly and feels resistant for daily use.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on March 13, 2026
G
Verified Purchase
Greybeard
Houston, US
★★★★★ 5
Hand size mighty grinder
Color: Silver single
Hi- I think this is a good grinder although to this point I ground about 2/3 of the glass chamber full of a good quality peppercorn. I like a coarse grind and this device gives that grind consistently. I like the cover and it's fit. The overall look is pleasing and think it's a good bang for the buck. It's easy to use and adjusts to your personal needs or wants. If your debating this device and am worried if you'll get years of use I know I don't force it but rather learn to allow the tool to do the work. I think it will last me for quite a while and even if I have to replace it once a year it's a well built unit that you can enjoy using. If you have arthritic hands and use this for hard products like fresh peppercorns or coarse Himalayan salt then treat yourself to a good rechargeable grinder (or better yet ask your children to get you one for all the great meals you make for them & have made for them !) Thanks for the read. I hope this helps. Greybeard
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Reviewed in the United States on May 6, 2026
A
Verified Purchase
Adriana B.
Lowell, US
★★★★★ 5
At Last! A Grinder That Can Grind Flaxseed!!!
Color: Silver single
I'm so excited -- my search for a manual flaxseed grinder is over! After spending countless hours -- nay, days & weeks! -- searching for a simple, manual spice grinder that worked well for flaxseeds, I found this little $7 gem! Just got it today & immediately tested it out... with GREAT results! At first I was disappointed to see that the grinding mechanism is plastic, but it sure did the job! It has a little dial to adjust the coarseness, which is nice. Also love that the container is glass; and larger than I thought. Easy to refill & I expect it'll be easy to clean. I think the ease of grinding will depend on how tightly or loosely you adjust the dial; at its tightest, I couldn't twist it at all, but loosening it allowed me to use it easily and it still gave me a fine grind. Highly recommend it... can't beat the value!
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Reviewed in the United States on November 15, 2025
T
Verified Purchase
Tennesee Resident
Louisville, US
★★★★★ 4
Pepper grinder works as expected, I'm concerned about its long-term durability.
Color: Silver single
Good product, grounds pepper as expected. I was almost surprised that the grinder is plastic rather than metal. I'm not sure of its long-term durability
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Reviewed in the United States on December 14, 2025
F
Verified Purchase
Francisco Gonzalez
San Leandro, US
★★★★★ 5
Perfect
Color: Silver single, Color: Silver single
Excellent salt grinder This ceramic grinder surprised me for its good quality. The design is very elegant, with the stainless steel part and the glass jar that allows you to easily see how much product is left inside. It feels solid and well built. The ceramic grinding mechanism works very smoothly and crushes the salt evenly. In addition, it is easy to refill and clean, which is very practical to use in the kitchen every day. It has a perfect size: it does not take up much space but has good capacity. Without a doubt it is a very useful and beautiful product for the table or the kitchen. I totally recommend it!
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Reviewed in the United States on March 15, 2026

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