452 plastic cap with 30mm neck size products are offered for sale by suppliers on Alibaba.com, of which lids, bottle caps & closures accounts for 65%.
A wide variety of plastic cap with 30mm neck size options are available to you, such as pe, as and stainless steel.You can also choose from non spill, non-refillable and recyclable plastic cap with 30mm neck size,as well as from white, clear, and blue plastic cap with 30mm neck size,