Polyplumb Stainless Steel Using 16mm pex-Al Pipe

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Hello All,

I've just ran my underfloor heating pipe using 16mm Pex-Al pipes and the fittings on the PB manifold are 15mm push fits, I was sold the 16mm to 15mm brass tail which seems to fit nicely but upon filling the system each one of the fittings leaked from the push fit side.

I've open the push fit caps to confirm they have a rubber seals and 2 plastic washers.

Any thoughts on this or have I been sold the incorrect fittings?

https://www.thefloorheatingwarehous...Copper-Tail--F1_S1216x15Cu_C_MUL.html#SID=221

Thanks!
 

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Which of the tails did you get, the long or short? If the short then you haven't pushed them all the way home (too much brass visible in your pic)
 

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