I'm sure many have heard this talked about but weren't quite sure what it is. So here goes, this is the cheapest and most effective way to bring a pipe through an EPDM liner. I don't advocate having pipes sticking into the pond but I know as well as anyone it may be necessary at some point.
Dome right there can be very little protruding into the pond, such as for a TPR or a coupler can be used to extend it to retro skimmers and bottom drains. The nice thing is if there's a dirt back you can angle the TPRs with only a slight wrinkle in the liner.
The best is that it can be used on any sized pipe, the only cost difference is a larger hose clamp. Compare that to a 3" or 4" bulkhead fitting.
One word of caution, use only high quality hose clamps. While the band is stainless on most the screw drive mechanism isn't always and rusting could lead to problems down the road.
Garrett