Stopper with Size 15 O-Ring Joint

O-ring, Viton®

TN Lab Supply Stoppers Natural Rubber Material

NMR Tube Washer

AF-0070 - ADAPTERS, 15MM O-RING JOINTS, AIRFREE®, SCHLENK- Chemglass Life Sciences

Separatory funnel with Teflon stopcock, 500mL, 24/40 outer joint on top, supplied with a 24/40 glass stopper.

500 mL 24/40 Separatory Funnel w/ Teflon Stopcock

The Glassware Gallery: Glassware Joints

Rubber Plug Silicone Hide From View Plugs 4mm5mm6mm8mm9mm10mm12mm14mm16mm Joint Hole Ring Pipe Cap Sincere Washer Round Stopper - Gaskets - AliExpress

O-rings are one of the simplest, yet most engineered, precise, and useful seal designs ever developed. They are available in various metric and inch

DANCO #122 O-Ring (Bag of 20) 14679W - The Home Depot

White Food Grade Silicon Rubber O-Ring Seals Washer Cross Section 2.4mm OD 8-54mm - AliExpress

Cap Stopper, O-Ring #15