This stainless ball valve assembly has a PCO 1881 female thread on one side for attaching to the male thread on the lid of your FermZilla and a 3/4″ BSP Female thread on the other side for attaching to tri-clover fittings for example.
The 20mm bore (approx.) makes it possible to perform low oxygen dry hopping through this ball valve.
NOTE: Dry hop pellets will require a bit of a shake to get them to fall through the 20mm bore. If you tap the PET Coke bottle this should be enough to make the hops fall down into the fermenter through the ball valve.
If you are wanting to use a coke bottle or other soft drink bottle for low oxygen dry hopping with the FermZilla then please use the PCO1881 x PCO1881 Female Ball Balve – Dry Hop Device for FermZilla