While the material within the Vent Opener lasts a long time, eventually it can lose its ability to expand and contract and it will be time for a replacement cylinder. Use only with the Standard Vent Opener.
September 7, 2012 - Charlotte from Peaceful Valley
Warm up your cold frame with help from your friendly neighborhood horse. Horse manure will raise the temperature in a cold frame, and our automatic vent openers will keep the cold frame from over-heating.…