Product Description Mastercool 2-way brass charging and testing manifold 33636 This manifold works with R12, R22, R502. Hose connections are 1/4" SAE Gauges are 2 1/2" and can be calibrated to maintain accuracy You will also receive (3) 36" charging hoses with standard fittings Anti-flutter gauges smooth out needle movement. Piston type free-floating valves reduce o-ring wear. Made in USA.