I had a plumbing contractor install under ground dwv for a new build but had several leaks which i think are all repaired. my concern is over a fitting that was replaced mid run, buried except for 4' section, by forcing the 3" pipe up enough to install a coupling. by my logic there is no way the pipe and fitting would be seated to full depth. In a sewer application is this a problem or am i worried for nothing? Thank you