UNIVERSAL VALVE ADAPTER: Converts Presta valve (thin) to Schrader valve (coarse), SV to AV for easy inflation with almost any air pump or even service stations / car gas stations. Suitable for bicycle pumps, air pumps, floor pumps or compressors. Compact and lightweight: allows you to carry your adapter conveniently placed on the valve of your bicycle to use it when needed without the need to permanently install it. Easy to use: Convenient and easy bike inflator adapter. Just screw the adapter into your slim valve and then you can inflate the tire with universal pumps. High quality: sturdy adapters made of solid brass and stainless steel, durable, premium and solid material, resistant to corrosion. Pack X4: This set includes 4 Presta to Schrader adapters for bicycles from valves with seals for bicycles (for Presta valves, thin) from SV Sclaverand Ventil to AV (car type).