Some alternatives to the clippard mouse solenoid. Both of the above pics have 0.65 watts and 10/32. No idea about pricing.
I wonder why people don't go for those "cool touch" solenoid. They are low watts and are cheap, most commonly found on Aquateks. It's a chinese manufacturer if I recall correctly. There is also a 2.4 watt warm to the touch solenoid from CS (British) that is on my Aquatic Life, again, they sell for cheap. I'm not sure about the maximum pressure they can hold but I'm certain they are usable to our hobby. Why the huge love for hot burkert ?