burst

Hi All, Need some help please. I've a 2003 sft Shocker with original front reg & macro line hose to a CP on/off ASA. It's connected to a Pure Energy Reg & 4.5k 0.7ltr bottle. I pressurised the marker this morning & the macro line hose burst. I've replaced the section of hose but it's burst...

Picked up a bottle second hand a couple of months ago and had absolutely no issues with it on the day, worked perfectly. I had it filled to 3k at a dive shop two weeks ago just so I could do some drills in my garden and I put it away after running it down to around 2k PSI. I was getting my gear...