To hold a filler valve firmly and free to remove in the inside of a gas filled passage by furnishing a mechanical screw part formed on an outer surface of a body of the filler valve and engaging it with a complementary screw part in the gas filled passage.

A valve body 80 has an integral type screw part 98 formed in the circumference of an outer surface of the body 80 adjacent to one end 84 of the body 80. Additionally, the body 80 is constituted so as to complementally engage with a female screw 36 of a gas filled passage 14, facilitates assembly of the valve body 80 and easily holds the valve body 80 in the inside of the gas filled passage 14. A hexagonal cavity 100 formed on the one end 84 of the body 80 forms a part of a passage 82, is constituted so as to receive a complemental shape tool (such as an Allen wrench), and rotates the valve body 80 so as to be engaged with the gas filled passage 14 in a screwing state.