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R-4990 Series - Heavy Duty Trench Frames with Grated or Solid Covers
R-4990-AX	8	1 1/2	6	x	x	x	x	x
R-4990-BX	10	1 1/2	8	x	x	x	x	x
R-4990-CX	12	1 1/2	10	x	x	x	x	x
R-4990-DX	14	1 1/2	12	x	x	x	x	x
R-4990-EX	17	1 1/2	15	x	x	x	x	x
R-4990-FX	20	1 1/2	18	x	x	x	x	x
R-4990-GX	23	1 1/2	21	x	x	x
R-4990-HX	26	1 1/2	24	x	x	x			x
R-4990-JX	30	2	27	x	x	x
R-4990-KX	33	2	30	x	x	x	x
R-4990-LX	36	2	33	x	x	x
R-4990-MX	39	2	36	x	x	x
R-4990-NX	45	2	42	x	x	x
R-4990-OX	51	2	48	x		x
R-4999 Series - Bolted Transverse Drainage Structures
R-4999-AX	8	1 1/2	6	x	x	x	x	x
R-4999-BX	10	1 1/2	8	x	x	x	x	x
R-4999-CX	12	1 1/2	10	x	x	x	x	x
R-4999-DX	14	1 1/2	12	x	x	x	x	x
R-4999-EX	17	1 1/2	15	x	x	x	x	x
R-4999-FX	20	1 1/2	18	x	x	x	x	x
R-4999-GX	23	1 1/2	21	x	x	x
R-4999-HX	26	1 1/2	24	x	x	x			x
R-4999-JX	30	2	27	x	x	x
R-4999-KX	33	2	30	x	x	x	x
R-4999-LX	36	2	33	x	x	x
R-4999-MX	39	2	36	x	x	x
R-4999-NX	45	2	42	x	x	x
R-4999-OX	51	2	48	x		x
Airport Trench Drains for Hangers, Gates, and Taxiways (All grates are type A unless specified available otherwise.)
R-4990-AA	8	2	6	Gray Iron Class 35
R-4990-BA	10	2	8	Gray Iron Class 35
R-4990-CA	12	2	10	Ductile Iron
R-4990-DA *	14	2	12	Ductile Iron
R-4990-EA	17	2	15	Ductile Iron
R-4990-FA	20	2	18	Ductile Iron
R-4990-HA * **	26	2	24	Ductile Iron
R-4990-KA2 *	34	2	31	Ductile Iron
R-4990-OA	51	2	48	Ductile Iron
Type "X" frame is supplied in Gray Iron Class 35. Refer to R-4990 Series on pages for details and installation instructions. * Type D solid cover available ** Type A grate available with Permagrip.
R-4999 Vane Style Grates for Bolted Transverse Drainage Structures
R-4999-L2	12	1 1/2	10	***
R-4999-L3	14	1 1/2	12	*
R-4999-L6	23 7/8	2	21 7/8	**
R-4999-L9	29 3/4	2 1/2	26 3/4	***
This series furnished with Type L grate shown at right. * Furnished in 2-foot increments only. ** Furnished in 1 or 2-foot increments. *** Furnished in 1 1/2 or 3-foot increments.