Premium Mycology Lids Hose Barb Thru-Bulk Bulkhead Fittings. Optimize Your Mycology Experience: Crafted from high-quality PP (Polypropylene), our hose barb thru-bulk bulkhead fittings are engineered for mycology enthusiasts. These durable, light, and small fittings are autoclavable and reusable, making them an essential tool for extracting liquid culture. The 1/4 inch thru-bulk bulkhead fittings can also be widely applied for home aquarium, fish tank, garden, laboratory, food and beverage factory, etc.