8 inch ID) hose is intended for connecting hot water heaters to coolant circulating systems of ground vehicles. The hose and hose assemblies described in this CID are hereinafter referred to as "hose".

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A-A-52426A

3.3 Physical requirements.

3.3.1 Burst pressure. Hose shall not burst at any pressure below that specified in table X when tested in accordance with ASTM D380.

TABLE X. Hose burst pressure.

Type	Nominal ID (inch)	Min burst pressure (psi)
I	3/8	425
	1/2	425
	5/8	425
	3/4	425
	7/8	425
	1	375
	1 1/8	375
I, II & III	1 1/4	350
	1 3/8	350
	1 1/2	350
	2	325
	2 1/4	300
	2 3/8	300
	2 1/2	250
	2 3/4	200
	3	200
	3 1/2	175
	4	150
IV	1/2	350
	5/8	275
	7/8	200
	1 1/8	175

3.3.2 Durometer hardness. Hose durometer shall be as specified in table I when tested in accordance with ASTM D2240.

3.3.3 Tensile strength and elongation. Hose tensile strength and elongation shall be as specified in table I when tested in accordance with ASTM D412.

3.3.4 Resistance to heat. Hose resistance to heat shall be as specified in table I when tested in accordance with ASTM D573. Hose shall be aged for 72 hours at 350�F.

3.3.5 Resistance to oil. Hose resistance to oil shall be as specified in table I when tested in accordance with ASTM D471. Hose shall be immersed in test liquid IRM 903 for 72 hours at 212 �F.