"after reading the reviews, I bought a pack of this and speedfit pipes 15mm and 22mm. I converted all the pipes from 22 to 15mm on a shower pump in less than 1 hr and replaced the pump. a few videos from speedfit on youtube first and the job was done saving the use of a plumber."
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Review 3 for John Guest PEM212215WP Speedfit Reducing Elbow 22mm x 15mm
"While I have found JG speedfit to be excellent, this elbow has a problem, in that the 15 mm side does not have the usual locking mechanism of the other bits, which means that 15 mm copper pipe would not stay in the smaller side. The one I bought did not look like the one in the picture, which does seem to have the locking parts. Check before you buy."