I usually use Rainbird 100-DVF's, and they are good to me, though on occasion, I'll have to take the bonnet off and flush it out. In a crowded box, removing those screws can be a hassle. Has anyone used the Rainbird 100-JTV valves? Are they pretty much the same as a DV but with a jar top? They don't seem to have a flow control model, which is dissapointing.