This is used old stock the box is pretty beatup not as the one in picture but it is new old stock. Designed to be used with the CO2-REG. Using the CO2-EXP together with the CO2-REG allows 2 tanks to be connected and controlled. Extend time between required tank charges. The connection to the CO2-EXP is low pressure making installation safe and easy. The CO2-EXP comes with its own easy to read gauge and 1/4" interconnecting hose. 

Comes with:
  • High pressure regulator
  • Tank pressure gauge Indicates remaining CO2 tank level.
  • 3 ft 1/4" air tubing & fitting to connect to CO2-REG
  • Ability to connect multiple CO2-EXP extends time between tank changes

Benefits:
  • The unique CO2-EXP Expansion regulator allows multiple compressed tanks to be connected to a single regulator - flow gauge. This extends the time between tank changes.
  • The CO2-REG can be upgraded by adding the CO2-EXP / Expansion regulator
  • By increasing the amount of carbon dioxide in the air, plants can grow up to 40% faster and larger.

How to use:
  • Use a timer like the Sentinel DRT-1a to turn the CO2 solenoid On and Off at regular intervals.
  • Use an environmental controller like the Sentinel EVC-1 or DEC-4 to activate the CO2 solenoid only during the day and to coordinate the CO2 operation with the ventilation control.
  • For the most accurate function, use a PPM controller like the Sentinel CHHC-4 or CPPM-4 to measure and maintain the exact amount of CO2 in the growing environment at all times.
  • Use controller like the EVC01 or EVC-2 to activate the CO2 solenoid only during the day and to coordinate the CO2 use with ventilation control.
  • Use a Part-per-million CO2 controller like the CTC-1. Measuring the exact amount of CO2. In PPM, provides the most accurate method of control.
  • The most common recommendation for PPM levels for rapid plant growth is between 1000 and 1500 PPM. The plants will benefit most by maintaining the CO2 level within this range during daylight hours.
Free Shipping rates apply to the lower 48 contiguous states. Contact Us to get shipping cost to your area if not in the lower 48 states before purchase.

We ship all items discreetly
Whether you are a novice gardener or a mad scientist in the greenhouse, you will find a plethora of inventory and knowledge at the Spokane Organic & Hydroponic Supply centers. Our first store opened its doors in 2006 when Paul and mother Susan, both avid and life-long gardeners, joined together to share their passion and gardening experiences with the Spokane community. In 2010, Susan moved on to pursue other endeavors while Paul continued to expand the business.
Each of our two stores employ experienced staff members with traditional garden expertise and modern industry knowledge. With real-life experiences, our plant experts know the challenges of outdoor and year-round gardening and strive to help customers eliminate avoidable mistakes. Our alternative and earth friendly stores we have created will leave you with a sense of empowerment to develop your own efficient methods of growing and caring for plants. We look forward to your visit and hearing the plant stories you have to share with us!

We ship daily Monday - Friday. All orders will be shipped within 3 to 5 working days. Most will go within 24 hours. You will automatically receive a tracking # via email once we have shipped your order.
All domestic orders will be shipped by UPS, Fedex ground, USPS priority mail or USPS ground. If you need to use a special carrier i.e. PO BOX w/ USPS, please email us and let us know.
We will only ship to the address provided during payment.
We are not responsible for any packages that are lost or damaged if insurance is not purchased.
Shipping and handling rate is fixed and non-refundable.
Free Shipping rates apply to 48 contiguous United States.
Contact us for shipping cost to your area.
No returns
No returns are accepted on any nutrients and fertilizers
Be sure the item is what you want because of the no return policy 
Pictures may be different then product sold
We ship all items discreetly

Satisfaction :
Discreetly labeled, Professionally packaged, shipped as fast as possible with care read the feedback for proof. Our prices are competitive but the service is Priceless! We know how to ship liquids with no leaks and 100% satisfaction guaranteed.
Your satisfaction is very important to us! If you have any problem with your order, please do not leave negative comments.
Please Contact us ... we will help you out!
In the unlikely event that the item is sold out from our stock or on back order, we will contact you to see if you want to wait a few days or we will refund 100% of your money. YOUR choice.

Occasionally items sell from our brick and mortar store front before we are able to pull down our listing or adjust quantities. We try our best to fulfill these orders in a timely manner if possible. These cases are very rare, we will let you know as soon as possible and refund your money.