Rubber Stopper Size Guide

Need help working out what size rubber stopper you need for your glassware? This rubber stopper size chart will help you match them up. You can also browse our full range of beakers, flasks and test tubes.

Rubber Stoppers (all sizes in mm)

Size	Holes	Top	Bottom	Height	For Use With
0	Solid	12	9	16	12x100mm Test Tubes
1	Solid	13	10	20	15x150mm Test Tubes 50ml Glass Pear Shaped Flask 100ml Glass Pear Shaped Flask 25ml Glass Round Bottom Flask
1	1 Hole	15	10	26	50ml Glass Pear Shaped Flask 100ml Glass Pear Shaped Flask 25ml Glass Round Bottom Flask
2	Solid	16	13.5	17	18x150mm Test Tubes 10ml Glass Pear Shaped Flask 25ml Glass Pear Shaped Flask 25ml Glass Round Bottom Flask 25ml Glass Flat Bottom Flask
3	Solid	19	14	26	18x180mm Test Tubes 20x200mm Glass Test Tube Screw Cap 50ml Glass Round Bottom Flask 100ml Glass Round Bottom Flask 50ml Glass Flat Bottom Flask 100ml Glass Flat Bottom Flask 25ml Narrow Mouth Erlenmeyer Flask
3	1 Hole	19	14	26	50ml Round Base Boiling Flask 50ml Glass Round Bottom Flask 100ml Glass Round Bottom Flask 50ml Glass Flat Bottom Flask 100ml Glass Flat Bottom Flask 18x180 Test Tubes 18x150 Test Tubes 20x200mm Glass Test Tube Screw Cap
4	Solid	21	16	26	100ml Glass Round Bottom Flask 100ml Glass Flat Bottom Flask 20x200mm Glass Test Tube Screw Cap
5	Solid	22	18	27	100ml Glass Round Bottom Flask 100ml Glass Flat Bottom Flask 20x200mm Glass Test Tube Screw Cap
6	Solid	23	17	26	50ml Narrow Mouth Erlenmeyer Flask 20x200mm Glass Test Tube Screw Cap
6	1 Hole	28	18	26	25ml Wide Mouth Erlenmeyer Flask 20x200mm Glass Test Tube Screw Cap Soda Bottle
7	Solid	26	21	29	250ml Distilling Flask with Sidearm 50ml Narrow Mouth Erlenmeyer Flask 25x200mm Test Tubes
7	1 Hole	27	21	25	250ml Distilling Flask with Sidearm 50ml Narrow Mouth Erlenmeyer Flask
8	Solid	27	22	28	100ml Narrow Mouth Erlenmeyer Flask
9	Solid	29	24	29	50ml Narrow Mouth Erlenmeyer Flask
10	Solid	33	27	30	500ml Vacuum Filtering Flask 500ml Distilling Flask with Sidearm 250ml Glass Round Bottom Flask 500ml Glass Round Bottom Flask 250ml Glass Flat Bottom Flask 500ml Glass Flat Bottom Flask 50ml Wide Mouth Erlenmeyer Flask 250ml Narrow Mouth Erlenmeyer Flask
10	1 Hole	33	27	30	500ml Vacuum Filtering Flask 500ml Distilling Flask with Sidearm 250ml Glass Round Bottom Flask 500ml Glass Round Bottom Flask 250ml Glass Flat Bottom Flask 500ml Glass Flat Bottom Flask 50ml Wide Mouth Erlenmeyer Flask 250ml Narrow Mouth Erlenmeyer Flask
11	Solid	34	30	31	1000ml Distilling Flask with Sidearm
12	Solid	36	31	31	100ml Wide Mouth Erlenmeyer Flask
12	1 Hole	35	30	32	100ml Wide Mouth Erlenmeyer Flask
13	Solid	40	33	25	1000ml Narrow Mouth Erlenmeyer Flask 1000ml Round Base Boiling Flask 1000ml Vaccum Filtering Flask 500ml Narrow Mouth Erlenmeyer Flask
13	1 Hole	41	32	25	1000ml Round Base Boiling Flask 1000ml Vaccum Filtering Flask 500ml Narrow Mouth Erlenmeyer Flask
13	2 Holes	40	33	25	1000ml Round Base Boiling Flask 500ml Narrow Mouth Erlenmeyer Flask
14	Solid	40	36	31
14	1 Hole	40	36	31	2000ml Narrow Mouth Erlenmeyer Flask
15	Solid	44	36	25
15	1 Hole	43	36	25
15	2 Holes	45	37	25
16	Solid	47	39	36
17	Solid	48	42	38	2000ml Narrow Mouth Erlenmeyer Flask 2000ml Flat Bottom Flask 500ml Wide Mouth Erlenmeyer Flask
18	Solid	51	45	40	500ml Wide Mouth Erlenmeyer Flask 1000ml Wide Mouth Erlenmeyer Flask 1000ml Round Bottom Flask
19	Solid	53	49	40	250ml Wide Mouth Erlenmeyer Flask 1000ml Round Bottom Flask 1000ml Wide Mouth Erlenmeyer Flask
20	Solid	59	50	41
21	Solid	61	54	4	1000ml Narrow Mouth Erlenmeyer Flask
22	Solid	65	57	41	5000ml Narrow Mouth Erlenmeyer Flask
23	Solid	65	60	38
24	Solid	70	62	38	2000ml Wide Mouth Erlenmeyer Flask
25	Solid	74	66	45	2000ml Wide Mouth Erlenmeyer Flask