One of the soaker hoses in Mary’s Vassar Farms garden split lengthwise near one end:
Although the hose is fully depreciated, I thought it’d be worthwhile to cut off the damaged end and conjure an end cap to see if a simple plug can withstand 100 psi water pressure.
A pair of Delrin (because I have it) plugs with serrations fill the hose channels, with the outer clamp squishing the hose against them:
In real life, they’ll be pushed completely into the hose, with a generous layer of silicone
snot caulk improving their griptivity.
I started with 8 mm plugs, but they didn’t quite fill the channels:
Going to 8.5 mm worked better, although there’s really no way to force the granulated rubber shape into a snug fit around a cylinder:
Fortunately, they need not be leakproof, because leaking is what the hose does for a living. Well, did for a living, back before it died.
The clamps have a solid endstop, although it’s more to tidy the end than to hold the plugs in place:
The clamps need aluminum backing plates to distribute the stress evenly across their flat sides:
Those are 8-32 stainless steel screws. The standard 1 inch length worked out exactly right through no fault of my own.
The OpenSCAD source code as a GitHub Gist:
The original doodle, with dimensions vaguely related to the final model:
There is, as far as I can tell, no standardization of dimensions or shapes across manufacturers, apart from the threaded hose fittings.