About this item Universal Fit: nine tapered diameters provide broad compatibility with common laboratory filtration apparatus and glass tubing/stems for a secure interference fit Vulcanized Elastomer Construction: made from high-quality vulcanized rubber - elastic, abrasion-resistant, and dimensionally stable for repeated assembly/disassembly Glass Joint Protection: soft, compliant material cushions glass stems and joints, minimizing chipping, scratching, and stress during insertion or removal Modular Interlinking & Seal: can be used as a single adapter or linked between components; tapered collar geometry ensures reliable mechanical seal and axial tolerance Chemical Resistance & Safety: resists most acids and alkalis for routine lab use; do not expose to hydrofluoric acid (HF) - HF will corrode the rubber