My sand filter has developed a slow seeping leak when the pump runs from the insert unit that the barrel union threads onto. The leaking fitting is on the pool return outlet of the multiport, the filter is a Davey Crystal Clear 25 inch. I have disconnected the barrel union and then unscrewed the coupling/insert, on inspection it looks ok so I removed the thread tape and reapplied prior to refitment.
I am surprised that there is no o-ring or any other such gasket/sealer but the Davey manual confirms that its only thread tape that is used to create the seal of the threads. I have tried tightening up the fitting a bit more with a wrench but it still has that slow seeping leak there. The internal threads on the multiport look ok, I was contemplating that the thread tape may be forcing gaps in the thread at pressure but without tape the fit is pretty loose.
Can anyone suggest something else to try?