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Caterpillar

Standard Engine Accessories

Family Number	Description
10	Tubing
11-12	Outlet Extensions
13	Cones
20-22	Flex
23-24	Bellows
30-31, 31M, 32-39	Elbows
40-45	Tube Fittings
50-52	Wye Connectors
60-63, 70, 73, 75	Flanges
68	Explosion Relief Cover Kits
76	Gaskets
77	NBG Kits
80-81	Thimbles
82-83	Rain Guards
84, 84HD	Rain Caps (Standard & Heavy-Duty)
85	Brackets
86-89 Clamps

Connections	Description
40	Slotted ID Cuff
60	ANSI Pattern
61	Caterpillar
62	Cummins
63	MTU
70	ANSI Reducing/Increasing
73	Flared Flange
75	Stack Breaker Flange
90	Female Half Coupling
91	Male NPT
Abbreviations
L/OAL	Length/Overall Length
H/OAH	Height/Overall Height
R	Radius
NS	Nominal Size
WT	Weight
BHC	Bolt Hole Center
DIA	Diameter
ID/OD	Inside Diameter/Outside Diameter

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Part #	NS	OD	ID	BHC	BHS	Order
61T-040	4	5.5	4.06	-	4.13

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