.375 Magnum "Air-Purge" comes with adaptor collar and #10 special injection tips.   This design works on both the PX-7 PMC and the GX-7 Graco guns.  The tips are designed to be multi-use, moving from hole to hole and can be blown clear by opening the air bypass value on the gun.   Soak in cleaning solution and carefully drilled out for reuse.   The plastic ports are a wearable and replaceable part.