Description For use with our Needle Valve MAV or a CMF orifice. This spring allows the DS4 first stage to have a higher than factory IP. Consider pairing with our DS4 blanking plug for a fixed IP setting. This spring has same dimensions as original, but but is much stronger (hence the “beefy”). It will be possible to set the IP between 174 psi /12 bar to 290 psi / 20 bar. It will no longer be possible to set an IP below 174 psi /12 bar. 316 Stainless Steel Sold Individually When used in conjunction with our DS4 Blank Plug (for a static IP): Our “default” first stage intermediate pressure suggestion is 205 psi / 14 bar which will give a practical depth limit of 395 fsw / 120 msw. If a deeper maximum depth is needed, the intermediate pressure can easily be increased up to to 290 psi/20 bar for a practical depth limit of 585 fsw/177 msw. WARNING: Without specialist knowledge and understanding, using this product could result in serious injury or death. This Apeks DS4 Beefy Spring will change the way the Apeks DS4 first stage operates. IF YOU DON’T KNOW WHAT IT DOES, OR HOW TO USE IT – PLEASE SEEK PROFESSIONAL TRAINING BEFORE USE.
