This one is for Jerry, Bryan and 'Boots, because I know you guys have worked with large commercial systems We maintain a several hundred acre condo "neighborhood". It has one system that covers the entire place. The majority of was installed between now and 15 years ago (We've been adding to it for each condo as they build them, 77 condo's left to do...its huge.) Anyways, the original installers from long ago ran 4" main down the streets about 4' down, we come off those with 3" and 2" sub mains for each individual street block. We had a blowout last week on one of the 15 year old mains, it managed to blow out of a 45 fitting, I dug it out today and the 4" was glued into a 45 and then reinforced on one side with concrete. This will be my first time working with high pressure 4" line (100 gpm, 120 psi). A few questions on the repair. They make a 4" slipfix, I personally think it would work fine, is there anything wrong with using one? What about a Dawn Quick Couple? Should we concrete the fitting back in like the original one was? Gasketed pipe fittings? The original wasn't. Any advice?