1. Direct-acting normally closed type;2. The 3F series is made of aluminum pedals, and the 3FM series is made of plastic pedals. They are direct-acting, horizontal structures, compact and compact: 3. If the reversing time is long, you can choose the locking type;4. The locking mechanism is stable and reliable, and the unlocking is light and fast. However, due to structural size limitations, it cannot withstand frequent strong impacts. Category: Foot Valve, Brand: Airtac, Series: 3F