No. 5 stoppers fit standard 125-mL flasks; no. 8 stoppers fit 1-L flasks. Order no. 8B stopper 02924-02 separately at right to fit filter holders 02920-00 and 02921-00 to manifolds above. Filter holder 02923-10 is ideal for sterility testing of antibiotics and pharmaceuticals by bacteria retentive method described in USP XXI. This model includes funnel, filter base, aluminum clamp, and stopper. Model 02923-20 with sintered-glass membrane support meets EPA specifications for use in the Hazardous Waste Toxicity Test. Holder 02923-00, with stainless steel (SS) membrane support, provides ultraclean filtrate—screen does not shed particles.

To fit holder to manifold, order no. 8B stopper 02924-02 separately.