Howe Corporation Refrigerant Receiver System. S/N's: 4690, 4691, 4692. Nat'l Bd: 3980, 3981, 3982. Top Receiver- 30 Gallon, inside straight-wall dimensions: 1 ft. 3 in. dia. x 3 ft. 6 in. L. Middle Receiver- 9 Gallon, inside straight-wall dimensions: 1 ft. dia. x 1 ft. 8 in. H. Bottom Receiver- 30 Gallon, inside straight-wall dimensions: 1 ft. 3 in. dia. x 3 ft. 6 in. L. MAWP: 250 psi @ 650°F. Inlets/outlets: (2) 3 in. dia. ports, (2) 1/2 in. dia. port, (2) 1 in. dia. ports, (1) 1-1/2 in. dia. port. Note: vessels are labeled R407C (freon). Overall dimensions: 4 ft. 9-1/2 in. L x 2 ft. W x 7 ft. 9 in. H.