Report "Flowtech sprinkler pump comes loose of pvc connections.this seems to be a difference in expansion rates. on hot days in florida when pump is hot.connections that where tight loosen and allow loss of prime. trust me this is not an installation issue...fittings are tight,proper primer and glue is used..im a mechanical contractor! when weather cools problem resolves itself.thinking of applying small amount of pure silicon sealant in fittings at pump ,while reconnecting threaded fittiing to form a gasket to allow expansion..glueing to pump would limit future serviceability"