(57) A toy water gun with a simple configuration and easy handling, said toy water gun
(1) comprising a housing (10) having a grip part (11), a removable tank (3), a muzzle
part (4), a cylinder (20), a pump mechanism (2) having a piston (21) and a check valve
(6), a water passage connecting the tank (3) and the muzzle part (4), an operation
part (12), and a water stopper, wherein the piston (21) includes a piston head (21a)
at its end, a discoid ring mounting plate (23) being secured to the piston head (21a),
a ring groove (24) being formed between the piston head part (21a) and the rear of
the ring mounting plate (23). The ring mounting plate (23) has through-holes (25)
which communicate with the ring groove (24), and an O-ring (22) which is slidably
provided in the ring groove (24).
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