Brand: Proform Parts Manufacturer's Part Number: 66849 Part Type: Valve Spring Compressors Product Line: Proform Pneumatic Valve Spring Compressors Summit Racing Part Number: PRO-66849 UPC: 037995668496 Valve Spring Compressor Usage: Cylinder head off Valve Spring Compressor Material: Steel Valve Spring Compressor color: Black Quantity: Sold individually. Notes: Creates up to 350 lbs. of pressure with 125 psi. Proform Pneumatic Valve Spring Compressors Proform pneumatic valve spring compressors are the prescription to cut cylinder head assembly and disassembly time in half. To use these air tools， simply pull the trigger for up to 350 lbs. of force with 125 psi (will operate on a minimum of 100 psi). The compressor arm will slide for adjustment， employ a locking pin， and you have fast， easy installation on most cylinder heads. With the valve spring compressed， the keepers and retainers can be easily removed. Pressing the pressure release button retracts the piston and sets the spring free. The versatile compressors fit different rocker arm thread sizes. Removing valve springs can be a pain. Relieve the pain with the right medicine―Proform pneumatic valve spring compressors.