This is for .22 caliber which adds about 176% surface enlargement for more air flow.
"The successor to Huma-Air's high flow dual hole transferport; they have managed to optimize and even enlarge the air passage in this new version 2 of our High Flow V2 Dual Hole Transferport. The V-shaped transfer opening makes sure you will have the maximum and smoothest air passage area. The middle support bridge divides the transfer port into a dual hole port. This middle bridge makes sure the pellet or slug nose cannot fall into the enlarged transferport hole, but will be guided smoothly by the middle bridge into the barrel.
This dual hole transfer port has much larger air passage area compared to the oem port for maximum perfomance."
Pairs perfect with the Huma High Flow Pellet + Slug Probe I have posted for sale too
myhighpressureair.com
Retails for ~$40+shipping (from Huma website is cheaper but high shipping cost to US evens out near $50 total)
Selling in perfect condition for $38 shipped
"The successor to Huma-Air's high flow dual hole transferport; they have managed to optimize and even enlarge the air passage in this new version 2 of our High Flow V2 Dual Hole Transferport. The V-shaped transfer opening makes sure you will have the maximum and smoothest air passage area. The middle support bridge divides the transfer port into a dual hole port. This middle bridge makes sure the pellet or slug nose cannot fall into the enlarged transferport hole, but will be guided smoothly by the middle bridge into the barrel.
This dual hole transfer port has much larger air passage area compared to the oem port for maximum perfomance."
Pairs perfect with the Huma High Flow Pellet + Slug Probe I have posted for sale too
HUMA-AIR High Flow V2 Dual Hole Transfer Port
HUMA-AIR High Flow V2 Dual Hole Transfer Port, inrease the power of your fx with this Huma-air dual hole transfer port, for sale at High Pressure Pneumatics
myhighpressureair.com Retails for ~$40+shipping (from Huma website is cheaper but high shipping cost to US evens out near $50 total)
Selling in perfect condition for $38 shipped