I heard back from Wavin Osma,
Hi Tony,
Thank you for your enquiry.
The Hep2o system is fully compatible / interchangeable with the OsmaGold system. Therefore, Hep2o inserts can be used with OsmaGold pipe.
Kind regards,
Craig Eastwood
Technical Design Department
Orbia...
Hi Rob, I revealed more of the pipe and it has Osma Gold printed on it, so I am still unsure as to whether the Hep inserts would work. I have emailed Wavin this morning awaiting a reply.