Gas Prop - 120lb.-Extended Length: 26.34"-Stroke Length: 16.50". Replaces old lift supports on cargo doors, companion doors and more. Gas springs give you consistent performance which is superior to mechanical, spring type products. Makes packing and unpacking your storage areas easier and quicker. Includes ball socket type end fittings. Mounting brackets sold separately. 1/bag. Manufactured by AP Products. This RV gas prop replaces old lift supports on cargo doors, companion doors and more. Gas springs give you consistent performance which is superior to mechanical, spring type products. Includes ball socket type end fittings. Mounting brackets sold separately. 1/bag.