I'm servicing a commercial system that is about four to five years old. Since it was first installed I've had to repair blow outs under 1812's, due I think, to using the wrong glue. This company uses the thick wall flex pipe for all their heads, the kind that is fitting sized and solvent welded. Their joints just don't stay together so I'm into a double digit count for repairs. This year however a new problem has surfaced. I'll see a blow out and think ok, another failed joint, but after digging it up I find the body of the 1812 has split (vertical). I pulled out three in one day and they were all split in the same place. Not on the casting line but right above the side inlet towards the top. All were split the same with one split top to bottom through the side inlet. These were all fed from the bottom so the side inlet shouldn't have been disturbed from the factory torque. Anybody else run into this? Plus the flex pipe deal they should be using a 795 or similar I think. Personally I don't use the glue in flex pipe on repairs because I normally don't have time to let it set up. The most recent install I've come into contact with had the thin wall pipe with barbed fittings for their high pops. So far only a hand full of those connections have come apart.