Bulkhead fittings are on sale for $3.49. Apply coupon code THANKS10
for an additional 10% off, bringing the price down to $3.14 each. Coupon code requires a minimum purchase of $50 but it applies to all products on the site, not just the bulkheads. If you are an aquarium person or aquaponics hobbyist, you're probably aware these things usually cost around double the amount, so this is a pretty sweet deal.