Compression fitting on plastic pipe - General Plumbing - BuildHub.org.uk

Zone valve came with compression fittings (olive + nut) on both ends. Speedfit pipe fits just about, but despite tightening the nut I can still turn it and with enough turning I can pull it out (and when filling the circuit under pressure it started moving out as by magic). The olive does not see

Compression fitting on plastic pipe - General Plumbing - BuildHub.org.uk

Compression fitting on plastic pipe - General Plumbing - BuildHub.org.uk