The Mishimoto coupler bung is a game changer in the automotive industry! After trying this product, i can confidently say that I've found a reliable and efficient way to seal hoses and pulleys. The silicone material is strong and durable and the design ensures a snug fit. The bung also works great on high-pressure situations .The only downside is the price, but the outstanding quality compensates for it. I highly recommend this product to anyone who wants a long-lasting solution for their automotive needs..