5700 Series Primary Regulators feature a polycarbonate bonnet. Polycarbonate bonnets will not break, chip, or fade over the life of the regulator, requiring no tools for adjusting and setting outlet pressure. Designed for CO2 application the 5700 series delivers unsurpassed reliability and durability. The 5700 series feature Taprite’s built in 10-micron filter and quad tank o-ring design to keeping harmful containments out of your system and eliminating the need for CO2 washers. Sharing a common repair kit with the 5200 series, this regulator is a technician’s dream.