Met/ Imp End Cap . Available in 20mmX1/2" and 25mmX3/4". 
Philmac Fittings are WRAS approved and manufactured from high performance thremoplastic materials with outstanding impact, UV, chemical and corrosion resistance.
They incorporate all the benefits of Philmac's Slide & Tighten technology.
No pipe preparation nor force is required to push the pipe past the seal, so installation is fast and simple.
Just insert the required liner where applicable, then insert the pipe into the fitting, tighten the nut by hand then with a wrench.