The RSA supports have the advantage of the great deflection of the springs next to the casting shell that functions as an exoskeleton that protects the spring from movements of stops and starts of the equipment or from abnormal vibrations. Its anti-slip rubber base also performs the function of absorbing vibration and noise. To increase the load of these supports can be put a inner spring C99L lilac that gives 130 kg. more cargo with the same deflection. Comply with ASRHAE, book Applications, chap. 47, sec. 47.44, type 4 “Restrained spring isolators”.