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Active Air-Timer

Marsoni M251S
Sale price$123.59
Pay 4 payments of $30.90 a month.Shop Pay
Get it in 3 business days with 1 day shipping. Friday, May 29
Active Air-TimerDeliver growth boosting CO2 with our user friendly, easy to operate system. With its programmable timer, it will automatically maintain ideal CO2 levels for optimum growth. For small to medium size areas, select the COSYS; for larger than 10' x 10' areas, select the COSYS20. To use Hydrofarm's CO2 Flow Rate Calculator, click HERE NOTE: Current COSYS & COSYS20 now come equipped with a black rubber O ring that has replaced the white plastic washer.
Easy Shipping

Quick Dispatch:

Your Active Air-Timer orders ship within 1-2 business days.

Delivery Options:

  • Standard: 3-7 business days
  • Fast: 2-3 business days
  • Express: 1-2 business days

Order Tracking:

You'll receive a tracking link by email once your Active Air-Timer ships.

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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
4.9 ★★★★★
Based on 1349 reviews
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Product Reviews
R
Verified Purchase
Raymond h zick
Battle Creek, US
★★★★★ 5
Soft partial cotton t shirts
Color: Black, White, Dark Gray, Light Gray, Size: X-Large
Nice soft t shirts
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 31, 2026
M
Verified Purchase
Max M
Los Angeles, US
★★★★★ 1
Not for me
Color: Black, White, Dark Gray, Light Gray, Size: Medium
Quality is fair-returned
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 10, 2026
M
Verified Purchase
Me. Myself, and I.
Houston, US
★★★★★ 5
Nice shirt.
Color: Black, Size: XX-Large
Good neck height, not too high, firm neck grip without the choke feel. Clean look when wearing under an open shirt or looks good alone, Soft feel against the skin, and it washes well, no pulling or color fade. semi-form-fitting on the body, but not tight for the size. priced well.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 25, 2026
G
Verified Purchase
Garrett
West Palm Beach, US
★★★★★ 5
T-Shirts
T-Shirts are very nice. They run small. Order 1 size up
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on December 31, 2025
A
Verified Purchase
Amazon Customer
Whiting, US
★★★★★ 3
Mock turtle neck sagged and did not fit well.
Shirt is well made. Collar not so much. Sagged and did not fit well. Donated to Goodwill.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 29, 2026

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