Maybe repairing a Dolphin Pools pipe fitting isn't the most common reason to be reading this blog, but I think the fix is a bit nifty.
The problem was that the vacuum suction cleaner pipe for the pool was breaking up along the bottom edge where it plugs into the outlet to the pump. Gaffer tape had kept it going for a while but eventually the cracks became too large.
A trip to the pool bits shop revealed that the paart is no longer available - indeed the guy in there is trying to find replacements as several customers are looking for one. The mix of chemicals and UV light aren't good for the plastic obviously.
Anyway, a few minutes with some calipers established that the outside diameter of the connection was about 1/2mm larger than the inside diameter of plastic waste pipe. Grabbing an offcut from the garage, with a bit of shoving it slid perfectly over the broken section. A splodge of pipe adhesive solvent and the section is braced with a sheath of pipe.
It still clips into place but should last another few years.