An upper barrel boss may also be tapped for a second bleeder and/or blow connection.
An upper barrel boss may also be tapped for a second bleeder and/or blow connection.
上面的桶状凸起部可钻孔攻丝，用来安装第二个排气阀和/或吹气阀连接。
An upper barrel boss may also be tapped for a second bleeder and/or blow connection.
上面的桶状凸起部可钻孔攻丝，用来安装第二个排气阀和/或吹气阀连接。