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Originally, the HW100 exhaust valve/stem was in two parts (1) a Nylon or Acetal POM-C (the cheap stuff) shaft with a steel pin (2) a brass bush. The brass bush is a flow restrictor & could be removed to increase air flow to the barrel - this can be used to make the gun more air efficient. You could buy replacement exhaust valves/stem with the brass bush from any Weihrauch parts reseller.
Weihrauch decided to stop selling the valve with the separate brass bush & instead integrated them into one unit, (cost cutting exercise?) but it meant that you could no longer increase the flow through the exhaust port (to the barrel). This is important to tuners wanting to gain precious FAC shots. You can't buy the old style exhaust valve from Weihrauch outlets - they simply don't sell them.
We have precision manufactured a direct replacement for the original Weihrauch exhaust Valve which allows users to once again increase the flow through the exhaust port. Our Fast-Flow Exhaust Valve has been manufactured using genuine red Delrin® (Acetal POM-H - the expensive stuff) and precision ground stainless steel.
If you have an exhaust Valve with a brass bush on it, or a simple parallel pin (brass bush removed) then NO - yours is an older model that already has the original fast flow Exhaust Valve.
If you are happy with your gun and don't intend to tweak/tune or upgrade to FAC, then again the answer would be NO.
If you intend to tweak/tune or you want to convert to FAC (ticket holders) & you have the new style, restricted Exhaust Valve, then the answer would be YES.
Suitable for ALL calibres: .177 .20 .22 Best suited for FAC Models.
Carbine .177 may also benefit from the Fast Flow Exhaust Valve.
Available to buy:-