I'm having a lot of trouble sealing parallel pipe threads into Grohe shower fittings (Rapido SmartBox 35600 and Rainshower 26483000). The threads are G 1/2, which I believe are identical to 1/2" BSPP: I've used Flomasta male couplers (Screwfix 69358). I first tried 4-5 turns of PTFE tape, but got leaks; quite slow leaks (the fastest produced about 1 drop/min, some others gave just barely detectable seepage), but leaks nonetheless. I then removed the fittings, cleaned off the PTFE, and tried more tape (8-10 turns) - some still leaked. I've never had trouble with sealing threaded joints I've made in the past (and, for clarity, I was winding the tape on in the correct direction - clockwise looking towards the male thread). I've now used Tru-Blu sealant from Toolstation, gave it a good long time to cure (60 hours+), and I have still had leaks.
What would people recommend? I've seen recommendations for Loctite 55, which is PTFE cord, I believe; does this have an advantage over tape? Also for Flomasta PTFE liquid from Screwfix; I went for the Tru-Blu stuff instead, as it seems the PTFE liquid sets quickly, and I was concerned that it would set, and then I'd risk cracking it when I was tightening the compression joints (which are all fine).
I'd be grateful for any advice - particularly from anyone who has (successfully!) fitted the Grohe rough-in boxes mentioned.
Thanks,
Rob
What would people recommend? I've seen recommendations for Loctite 55, which is PTFE cord, I believe; does this have an advantage over tape? Also for Flomasta PTFE liquid from Screwfix; I went for the Tru-Blu stuff instead, as it seems the PTFE liquid sets quickly, and I was concerned that it would set, and then I'd risk cracking it when I was tightening the compression joints (which are all fine).
I'd be grateful for any advice - particularly from anyone who has (successfully!) fitted the Grohe rough-in boxes mentioned.
Thanks,
Rob