Robert ManufacturingR605T-1-1/2 R605T High Turbo Series Bob Red Brass Float Valve, 1-1/2" NPT Female Inlet x Free Flow Outlet, 180 gpm at 85 psi Pressure

Pros: heavy, well built, works great for low upstream pressure applications.Cons: float arm socket is 3/8 threaded not 1/4 as stated in spec's.

This valve seizes easily, preventing the float from moving, particularly with a short arm float for tight spaces. The problem is that the plunger nitrile seal is slightly too large, and causes too much friction in the plunger, causing the binding or stickiness of the plunger. The seal prevents excessive spray from occurring around the plunger, which is mostly cosmetic, and only when the valve opens. In my case I am operating at low pressure, under 50 psi, so the plunger spray is minimal.The solution is easy: get rid of the sticking plunger seal. To do this you need to loosen the float nut and bolt, so the steel arms that connect the float to the plunger can be disconnected from the plunger. Then you need to remove the main valve seal and the metal washers around it. The seal and washers come out through the throat of the valve. The plunger can now be easily removed. Carefully pry the nitrile seal off the plunger stem. Reassemble. Now you have a valve that will not stick and will work with a lot less friction.-------------- Update ---------------This valve sticks. With or without the nitrile seal, it sticks enough that most of the time it won't close. It needs a little "nudge" to get pass the sticking point. So, I am removing it and will be trying a different design. This one is not good for me.

This takes a 3/8 inch rod and ball float. The description showing 1/4 inch incorrect just FYI. Also if you need to adjust the float mechanism for height all you have to do is loosen the nylon lock nut it is 7/16 but you also have to loosen the bolt directly at the adjustment point I struggled with this because I couldn't figure out until the very end that the bolt is threaded into the adjustment Point separately from the nut this is important to note do not unscrew or loosen the two bolts above the adjustment on the pivot. This is a nice heavy duty valve and should last a long time good quality but please fix your description on the float rod size thank you!

With a pipe of that size the valve does not open nearly enough to allow for full water flow as needed. There is always a lot of restriction.

That's about it