The Gas Anesthesia mask is installed over the incisor bar, with the cone opening toward the open “U”. The animal (rat or mouse) is installed by placing its teeth over the incisor bar, and sliding the adaptor forward until the cone is snug about the animal’s nose, thereby substituting for the nose clamp. The teeth and the cone provide a snug, stable hold. Anesthesia Masks enable gas anesthesia of rats or mice in a Lab Standard™ or other stereotaxic instruments, with minimal researcher exposure to anesthetic gases. Anesthetic gas flows in the tubing connector, past the animal’s nose, and out the other side. Spent gas may be routed to recycling, exhaust or gas analysis instruments. The Rat Gas Anesthesia Mask (51610) fits easily onto the 51621 Rat Adaptor (sold separately) Braintree避难所小屋II 一个舒适，安静的地方休息，或爬上去探索。切碎的材料（只是为了娱乐或筑巢），通常需要7至30天。直径4英寸x高2英寸，带有3个大窗户和更宽的门，可提供更安全的出入口。较大的孔还使工作人员可以轻松地将垃圾放在庇护所内，以观察它们。