Best Rubber Stopper For Fountain: Compare #10 and Assorted Sizes

#1 · Best Overall

1. Hillman #10 Rubber Stopper

• Dimensions: 1.94"W x 1.94"H
• Weight: 0.15 kg
• Material: Rubber

Best for: Large solid stopper applications.

Why it ranks #1: Its #10 size has a stated 1-15/16-inch top diameter, tapered design, and two-piece pack for matching larger openings.

A #10 size with a stated 1-15/16-inch top diameter makes Hillman's two-pack an option for larger bottle necks and openings. Its solid black rubber and tapered form are intended to create a tight seal, with uses listed for bottles, lab vials, and glass containers.

The tapered shape is described as easy to install and intended to fit a variety of bottle necks and lab containers, helping the stopper seat in compatible openings. Solid rubber construction is also described as resisting corrosion and airborne contaminants, which supports use when closing a glass container. The package contains two size #10 stoppers, rather than a range of smaller plugs. Check the opening dimensions before selecting it for a fountain, since the listing does not provide a fountain-specific fit chart.

Skip it if you need several small size options; Lhazemu's 30-piece set spans eleven sizes from #000 to #8.

Hillman is for buyers with a larger bottle or glass-container opening that suits a #10 stopper and who want two solid plugs. Its stated top diameter is the key boundary; this is not a small-size assortment for narrower fountain passages.

Listed on Amazon as: Hillman 52044 #10 Extra Large Rubber Stopper, 2-Pack

#2 · Broadest Size Range

2. Lhazemu 30-Piece Assortment

• Weight: 12.6 oz

Best for: Full-range lab sealing set.

Why it ranks #2: The 30-piece set spans 11 sizes from #000 to #8, with two each from #00 through #6 for multiple opening sizes.

Thirty pieces across eleven sizes, including #8, give this Lhazemu set broad coverage for matching a fountain opening to a tapered stopper. Its solid construction has no hole, and the listing describes it for sealing flasks, test tubes, and bottles against leaks.

The quantity breakdown includes twelve #000 plugs, two each from #00 through #6, and one each of #7 and #8. That favors repeated use of the smallest size while retaining a plug at the largest end of the range. The tapered design supports fitting different openings, and the solid, no-hole construction is intended for sealing rather than routing tubing through the stopper. Lhazemu also lists resistance to non-aggressive chemicals and concentrated solutions; compare the size chart with your fountain opening.

Skip it if you need several #7 or #8 spares; Newflager's assortment includes one of each too, while its listed distribution offers a different pack size.

This set is suited to buyers who want a full #000-to-#8 range and many #000 plugs for sealing laboratory-style openings. The large sizes are represented by one piece each, so check the opening and consider whether that quantity meets your replacement needs.

Listed on Amazon as: Laboratory Grade Rubber Stoppers, 30 Pieces Assorted Tapered Bungs Set, 11 Different Sizes from 000# to 8#, Solid Black Lab Supplies

#3 · Most #000 Pieces

3. Aleric Solid Rubber Stoppers

• Material: Rubber

Best for: Extra small-plug inventory.

Why it ranks #3: This 26-piece solid set spans #000 through #8 and includes ten of the smallest #000 size for repeated small openings.

Ten #000 stoppers in a 26-piece assortment make Aleric a useful choice when a fountain project calls for repeated trials with the smallest listed size. The range extends through #8, so the pack also covers a spread of larger openings for laboratory or industrial plugging tasks.

The pack includes ten #000 pieces, six #00 pieces, and two each from #0 through #6, plus one each of #7 and #8. That count distribution favors small sizes, which can be handy when testing several narrow fountain passages or keeping spares. Aleric describes the rubber as durable and not easy to deform, and the stoppers have no holes for sealing. The listing specifically excludes food and bathtub use, so keep the application to lab or industrial purposes.

Skip it if you need a fountain stopper specifically approved for food or bath use; Aleric explicitly excludes those applications.

This pack fits buyers who want many small plugs for laboratory or industrial sealing and a few larger sizes on hand. Its stated use boundary matters: the listing excludes food and bathtub applications, so keep fountain use within appropriate non-food sealing tasks.

Listed on Amazon as: Aleric 26 Pack Solid Rubber Stoppers – 11 Assorted Sizes Stopper Plugs, 000# – 8# Sizes Rubber Plugs for Flask, Lab Plug Holes, Test Tube

#4

4. Eoppen 24-Piece Stoppers

• Weight: 0.32 kg
• Material: Rubber

Best for: Reusable tapered plug assortment.

Why it ranks #4: The 24-piece set covers 11 assorted sizes from #000 to #8, offering more size flexibility than the single-size #10 plugs.

A tapered shape that is described as easy to insert and remove gives the Eoppen 24-piece set a practical advantage when a fountain stopper may need repeated fitting or removal. It covers eleven sizes, from #000 to #8, for comparing plugs against openings of different diameters.

Eoppen lists solid rubber construction with no holes and says the stoppers are not easy to deform, pairing a sealing form with reusable handling. The eleven-size range supports trying different plugs, while the tapered profile can ease insertion and removal during fit checks or maintenance. The listing identifies laboratory and industrial uses, including bottles and pipes, rather than supplying fountain-specific dimensions or guidance. Measure the opening and compare it with the stopper dimensions before settling on a size.

Skip it if you need a complete diameter chart to compare sizes; Newflager lists dimensions for all eleven plugs.

Eoppen is a reasonable option for buyers who want a reusable, tapered assortment and can measure their fountain opening independently. Its listed sizes span #000 to #8, but the supplied product details do not provide dimensions for individual plugs.

Listed on Amazon as: 24Pcs Solid Rubber Stopper 11 Assorted Sizes 000# – 8# for Flask, Plug Holes, Lab Seal Rubber Stoppers

#5

5. Lhazemu 22-Piece Stoppers

• Dimensions: 0.51"W x 0.67"H
• Weight: 0.34 kg
• Material: Rubber

Best for: Wide-range opening sampler.

Why it ranks #5: Its 11-size range from #000 to #8 includes a listed tapered lab-plug format, but the total count is lower than larger assortments.

A range of eleven sizes from #000 to #8 makes the Lhazemu assortment useful when a fountain opening needs a measured stopper match. Its tapered black rubber plugs are also listed for bottle and pipe stopping, giving the set a broad sealing role beyond its laboratory applications.

The supplied dimensions run from 13 mm top diameter at #000 to 42 mm at #8, with intermediate sizes to help narrow down a fit for a particular opening. Rubber construction is described as resistant to deformation and intended to provide good sealing performance, which supports repeatable plugging. The assortment includes 22 pieces, with six #000 plugs and two each of #00 and #0; the listing continues with larger sizes, though the complete quantity breakdown is not supplied.

Skip it if you want a fully stated quantity breakdown; Newflager's 21-piece set lists counts for all eleven sizes.

Choose this assortment if you want a broad size range for checking a fountain opening and value rubber plugs also listed for bottles and pipes. Use its diameter chart to judge fit; the available details do not specify every size's count.

Listed on Amazon as: 22 PCS Set of Black Solid Rubber Stoppers (11 Assorted Sizes) 000#–8# Tapered Lab Plugs for Sealing

#6

6. Newflager Rubber Stopper Set

• Weight: 8.8 oz

Best for: Mixed-size fountain opening kit.

Why it ranks #6: The 21-piece pack includes 11 sizes through #8, with listed dimensions that help compare tapered plug sizes to an opening.

Eleven tapered sizes, from #000 through #8, give this Newflager assortment options for testing different fountain openings without committing to one stopper size. The solid natural-rubber plugs are intended for laboratory applications, including flasks and test tubes, so the set suits buyers who need a range of small sealing plugs.

The size range spans stated top diameters from 13 mm to 42 mm, letting you compare progressively larger plugs against an opening. Its 21-piece count is weighted toward smaller sizes: five #000 stoppers, two each from #00 through #4, and one each from #5 through #8. That distribution gives extra small plugs for repeated use, while the tapered solid-rubber form supports sealing applications such as lab vessels. Match the listed dimensions to your fountain before choosing.

Skip it if you need several large replacements; Eoppen's 24-piece assortment also covers eleven sizes through #8.

This set suits fountain owners who are unsure which of several small openings they need to seal and want size choices in one package. Check the listed top and bottom diameters first; its quantities thin out at the larger sizes.

Listed on Amazon as: 21 Pack Solid Rubber Stopper, Black Lab Plug, 000# – 8# Sizes Assortment, 11 Assorted Sizes

#7

7. Kyuionty 22-Pack Stoppers

• Weight: 7 oz

Best for: Small-size spares for sealing.

Why it ranks #7: This 22-pack covers ten sizes from #000 to #7 and lists top and bottom diameters, though it does not include sizes #8 or #10.

Five #000 and three #00 stoppers give Kyuionty's 22-piece assortment a useful small-size reserve for buyers measuring a fountain opening. The ten-size range reaches #7, and the product is listed for plugging vials, containers, and pipes to help prevent leaks.

The pack has two pieces each from #1 through #5, then one each of #6 and #7, making it more balanced across midrange sizes than its five #000 and three #00 pieces might suggest. Kyuionty lists dimensions for every size, from #000 at 13/8 mm top/bottom diameter to #7 at 36/30 mm. Its rubber stoppers are described as providing a close fit and sealing; compare those dimensions with the fountain opening before use.

Skip it if you need multiple large spares or a #8 plug; Newflager's assortment includes #8 and lists its pack quantities.

Kyuionty suits buyers who want a dimensioned assortment with extra small plugs and coverage through #7. It is a practical candidate for measuring a fountain opening, but the largest two sizes come one apiece, so plan around that limited reserve.

Listed on Amazon as: 22 Pack Rubber Stoppers, 10 Sizes #000-#7

#8 · Largest #000 Pack

8. Enjoyist 27-Pack Stoppers

• Dimensions: 1.45"W x 1.18"H
• Weight: 0.32 kg
• Material: Rubber

Best for: Frequent smallest-size replacements.

Why it ranks #8: The 27-piece assortment has ten #000 plugs and sizes through #7, useful when small openings need multiple replacements.

Ten #000 plugs are the key reason to consider Enjoyist's 27-piece set: the quantity favors buyers who expect to use or replace the smallest size repeatedly. The assortment runs through #7 in ten sizes, with solid, hole-free rubber stoppers listed for non-aggressive or concentrated solutions.

This pack contains ten #000 pieces, two each from #00 through #6, and one #7, so its inventory leans heavily toward the smallest stopper rather than evenly distributing pieces. The listed top diameters increase from 13 mm at #000 to 37 mm at #7, which helps compare plugs with an opening. Its tapered, solid form is suitable for laboratory sealing tasks, but the range stops at #7 rather than including #8. Check the dimensions against your fountain neck.

Skip it if you need a size #8 option; Lhazemu's 30-piece assortment includes sizes through #8.

This Enjoyist pack fits buyers who need a substantial supply of the smallest plugs and want several intermediate sizes for lab-style sealing. It may suit a fountain opening within its listed range, but it offers no #8 size and should be matched by dimensions.

Listed on Amazon as: 27 Pack (10 Assorted Sizes) 000# – 7# Tapered Lab Bungs Solid Rubber Stoppers

#9

9. Enjoyist 19-Pack Stoppers

• Dimensions: 0.54"W
• Material: Rubber

Best for: Compact ten-size assortment.

Why it ranks #9: It offers ten sizes from #000 to #7, but its 19-piece count gives fewer plugs than several competing assortments.

Ten sizes from #000 through #7 give this 19-piece Enjoyist pack options for measuring a fountain opening without adding the #8 size found in some broader sets. Its rubber stoppers are listed for non-aggressive or concentrated solutions, supporting small-scale sealing tasks.

The package count is two each for #000 through #6 and one #7, according to the supplied description. That even spread across the smaller and middle sizes can help when you want several candidates to compare against an opening, while the single #7 offers a larger option. The product listing recommends checking sizes carefully, and dimensions are provided from 13 mm top diameter at #000 to 37 mm at #7. Use those measurements to assess a fountain fit.

Skip it if you need a #8 option; Enjoyist's 27-piece set also stops at #7, while Lhazemu's 30-piece set reaches #8.

This pack suits buyers who want a modest quantity across ten sizes and can use a range ending at #7. The included dimensions help with selection, but check the fountain opening carefully and account for having only one stopper at the largest size.

Listed on Amazon as: 19-Pack (10 Assorted Sizes) 000# -7# Solid Rubber Stoppers

#10

10. RiteBrew Size 10 Stopper

• Dimensions: 2.01 x 2.01 x 0.98 in
• Weight: 2.4 oz

Best for: Airlock or tubing connection.

Why it ranks #10: Its 50 mm top diameter suits a large opening, but the stopper is drilled for tubing or an airlock rather than a solid seal.

A drilled opening is the defining feature of this size 10 RiteBrew stopper, allowing it to accept an airlock or tubing rather than acting as a solid plug. Its stated 50 mm top and 42 mm bottom diameters make it a specific option for larger openings that need a pass-through.

The size 10 form and listed top and bottom diameters help identify whether this stopper can seat in a particular fountain opening. Because it is drilled to accept an airlock or tubing, it supports a routed connection or passage through the stopper, unlike a solid sealing plug. That hole also means it is not the choice when the goal is to close an opening completely. The product listing supplies dimensions but does not specify the drilled-hole diameter.

Skip it if you need a completely closed opening; Hillman's solid #10 stopper has no listed drilled passage.

Choose RiteBrew when a larger fountain opening needs a stopper with a passage for tubing or an airlock. Its 50 mm top and 42 mm bottom diameters are the fit references; avoid it when a solid, hole-free seal is required.

Listed on Amazon as: Rubber Stopper – Size 10 – Drilled