Underhill Spray Head Removal Tool

Are the cap themselves fpt. or mpt ? some sprinker nozzles requires fpt while others come in mpt

Does this cap thread on to the pop-up stub after you remove the spray head? I want to test spray heads in zone for possible leak .

Will this fit the nozzle of a hunter pro-c sprinkler - the nozzle is screwed to a riser that has a 12mm or 4/8" i.d. opening?

Would this work on a Toro 570 series sprinkler head?