Buoyancy of its float ball provides force to operate internal valve assembly to relieve condensate and overflow to drain. Features steel chamber, brass/ bronze internal valve, 316 stainless steel float ball, sizes 1" through 2" with NPT connections, and 3" through 6" with 150 FLG. Pressure drops to 15 PSI. Condensate and capacity to 500,800 #/HR. large end cover provides easy access to internal sight glass assembly. Photo:3" 313. Brass/ bronze internal valve assembly with 316 stainless steel float ball and float arm shown separately.