Hey there.
Currently using:
OpenBlocks-1.7.10-1.3-snapshot-428
OpenModsLib-1.7.10-0.6-snapshot-222
Seems like sprinkler are not working properly.
Atleast not the visual part.
Take a look at this video to see what happens:
https://www.youtube.com/watch?v=ue8sm9j4XcI
It seems like its still working the way it should.
Its just not creating the water particles to the correct direction.
Sorry for my bad english. I hope its not to hard to understand.

Confirmed, working on this now.

I don't know if this may still be an issue, but I am seeing this problem with the following versions:

Java 1.8u25
MC 1.7.10
Modpack direwolf20 (FTB Launcher)
OpenBlocks-1.7.10-1.3-snapshot-433
OpenModsLib-1.7.10-0.6-snapshot-224

Which are the current versions put out with the direwolf20 1.0.2 modpack for MC 1.7.10.

Related: #617