The reason for 24 " and GUE is because hose lengths assume doubles. The spg coming off the left post is a little short for singles and the necklaced back up reg coming off the right is a little long for singles. I eventually dropped the 24 in spg and replaced it with a 26 or 28 for singles. I have since gone back to the 24 clipped off to my plate as my primary SPG is a wireless SOL.