INSTALLING SHOWER WITH TECTITE PUSH FIT ACCESSORIES B+Q

HI I AM CURRENTLY IN THE PROCESS OF INSTALLING A SHOWER AND HAVE FOUND A BRANCH PIPE WITH END CAP COMING FROM WATER TANK IN LOFT AM I ABLE TO USE THIS TO SUPPLY SHOWER ?
THE PIPE IS 15MM COPPER AND I WOULD LIKE TO EXTEND IT TO ABOUT 2 METERS AWAY INTO THE SHOWER.
I HAVE BEEN TO B+Q AND HAVE SEEN THESE BRASS FITTINGS CALLED TECTITE PUSHFIT FITTING AND THE LOOK TO BE A BIT MORE SOLID THAT THE SPEEDFIT ONES WOULD I BE ABLE TO USE THESE AND SOME 15MM PIPE WITH A COMPRESSIN ELBOW AT THE SHOWER INLET ?
aNY ADVISE PLEAZE THANKS

um...what sort of shower, power, mixer, electric?

this is an electric shower
any help?

you need to be tee'ing off from a pipe supplying mains pressure...if it is a mains feed into the tank then fine, if its a gravity feed from the tank then no good. speedfit is ok if you put pipe in straight, never used the other stuff