Haldex GP3030K 30/30 Type Piggyback Air Brake Chamber Kit, 2.25" Standard Stroke

Universal Fitment Features 3/8" air port thread, round inlet type, and compatible with most 30/30 piggyback-style brake setups
30/30 Piggyback Kit Includes spring and service chamber; direct-fit Replacement for standard truck and trailer air brake systems.
2.25" Standard Stroke Delivers reliable actuation and safe stopping power for heavy-duty commercial vehicles.
Cross References: 
Automann
179.PB3030S
Bendix
3030STD-KIT
Bendix
5007610
Bendix
BXNT3030ELSKIT
Bendix
NT3030ELSKIT / NT3030STDKIT
TRP
3030PBK / PF3030PB / SB63030
Haldex
GP3030K / HDX GP3030K / PB3030S
Fleetrite
FLT3030SB28
Paccar Parts
3430008 / SB3030PKC
Freightliner
ABP N42A 30PBK3D / BX 5007610
Proline HD
PLBPS-3030K
Genuine Newstar
S-17214 / XX-3030-PSK
ProPar
3030PK / T3030PK
Torque
TR3030PBK
Di-Pro Inc.
TK18500
Navistar
ZAJ 3430008