Gas struts or springs are used in caravans and RV's for helping to lift and hold heavy things like the roof of a pop-top or lifting an island bed to get under for storage.
It is important to use the right gas straut aes there are many different varieties.
Important factors to consider are strength extended length and compressed length. All of these factors are important to the correct installation and working ability for the job they are designed to do.
Other things that may help a choice are the shaft size and the ball joint size. The most commly used ball joint on RV are 10mm
Length: 825mm (Centre to Centre of Ball )