This stainless ball valve assembly has the PCO 1881 female thread on both sides. The 20mm bore (approx.) makes it possible to put some dry hops into a Coke bottle or other soft drink bottle, attach it to the ball valve and use a closed loop to dry hop into your FermZilla.
As show in the photo, if you use this stainless ball valve in conjunction with the PCO 1881 Tee Piece and the Carbonation Cap (red or yellow), you will have the added advantage that you will be able to use CO2 gas to purge out oxygen from the hops before you dry hop. This assembly makes an inexpensive and very effective dry hopping tool.
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.