... with Sight Glass Block type of aircraft alloy aluminum manifold set with heavy duty hoses according,red/blue shock proof ... pretectors are avaiable for each set.Brass Manifold set with Sight GlassHigh quality fored brass manifold set with 2-3/4" red ... side couplers fited with 1/4" SAE maleCT-466GFSingle gauge manifold with blue gauge for R12,R22,R134a and shock proof ...