10-02-2022, 10:25 AM
(This post was last modified: 10-02-2022, 10:25 AM by Stuart Giles.
Edit Reason: missing word
)
As Hugh says, quite possibly a mis matched thread. You may have been given a 1/4" NPS fitting (National Pipe Straight) these are 18 TPI. 1/4" BSP fittings are 19 TPI. Some of the bigger NPS/NPT fittings have the same thread count as BSP items, but they still Won't make a good seal as the thread form is also different.