The Madbull steel fill valve is compatible with many gas-powered guns as well as Madbull 40mm gas grenades (1 pc). Its durable construction allows CO2 filling for gas grenades designed for carbon dioxide. The valve also works normally with standard gases.
The fill valve thread is the same as used by KJW and WE in their gas guns. The valve head diameter is 7.5mm, which may limit compatibility with certain magazines or grenades.
