Caps for Boston Round LDPE and HDPE Plastic Bottles Closures for boston round LDPE and HDPE plastic containers are available as caps, discs, polytops, pumps, and fine mist sprayers. These closures come in a wide assortment of sizes. 15-415 White Dropper Cap with Tip 15-415 White Dropper Cap with Dropper Tip 15-415 White Cap 15-415 White Cap 20-410 White Polypropylene Polytop 20-410 White Polypropylene Polytop for Liquids 20-410 Fine Ribbed Polypropylene Cap 20-410 Fine Ribbed Cap 20-410 Fine Mist Sprayer 20-410 Fine Mist Sprayer 20-410 Smooth Disc 20-410 Smooth Disc 20-410 Pump 20-410 Pump 20-410 Spout Cap With Red Sealer Tip 20-410 Natural Spout Cap With Red Sealer Tip 24-410 White Polypropylene Polytop 24-410 White Polypropylene Polytop for Liquids 24-410 Fine Ribbed Polypropylene Cap 24-410 Fine Ribbed Cap 24-410- 4 oz. Fine Mist Sprayer 24-410- 4 oz Fine Mist Sprayer 24-410 - 8 oz. Fine Mist Sprayer 24-410 - 8 oz. Fine Mist Sprayer 24-410 Smooth Disc 24-410 Smooth Disc 24-410 Spout Cap With Red Sealer Tip 24-410 Natural Spout Cap With Red Sealer Tip 24-410 Pump 24-410 Pump 28-410 White Polypropylene Polytop 28-410 White Polypropylene Polytop for Liquids 28-410 Fine Ribbed Polypropylene Cap 28-410 Fine Ribbed Cap 28-410 Smooth Disc 28-410 Smooth Disc 28-410 Pump 28-410 Pump 28-400 White Polypropylene Cap 28-400 White Cap 38-430 Natural Buttress Linerless Cap Natural Buttress Linerless Cap