"I bought these taps as they had brass backnuts and were by a well known brand (I was replacing taps where the backnuts had split). Two days after installation I had a flood from the hot tap. On removing it, I found a casting pinhole in the seating to the pipe. I took the offending tap into my local store who ordered a replacement. A quick visual examination showed the replacement had a 1mm deep groove across the seating to the pipe - it would never have sealed. I eventually replaced them with a cheaper tap plus brass backnuts from Screwfix plumbing sundries. I was disgusted at the apparent total lack of any quality control: a visual examination would have revealed both faults. Thankfully Screwfix staff were great at helping solve the problem."