Here`s the gadgets.
I`m hoping to use my syringe type system to take trub dumps.
Because the plunger has a course thread I can open the gate valve and rotate the nut to slowly extract the trub.
Once the Polycarb tube is full I can close the gate valve and unscrew the whole syringe tube from the gate valve and empty the trub.
If the gunk is stuck to the taper in the conical I can insert the stiring mechanism to free it up.
I can repeat this until there is no more trub, and also push whatever beer is in the tube back into the conical and close the gate valve.
I will also add another screw on cap to the bottom of the gate valve to keep it sanitised.
I could also make another screw on cap which holds a gas connector fitting for adding oxygen thru the gate valve.
I`m yet to make a lot of the parts so please have a look at this