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Air Conditioning and Heating / Caps

Shop durable A/C service caps for Class 3-8 truck and trailer HVAC systems, designed to protect refrigerant ports from dirt, moisture, and leaks. Midwest Heavy Duty carries high-quality replacement caps compatible with major brands like Freightliner, Kenworth, Peterbilt, Volvo, and International, ensuring a secure seal and proper system maintenance. Whether you're replacing missing caps or performing routine A/C service, our OEM-equivalent and aftermarket options offer reliable fitment and long-term durability. Count on us for fast shipping, great prices, and expert support to keep your fleet road-ready.

58 products found (Page 1 of 2)

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In stock
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-653TK5
CP-653TK5

A/C Service Valve Cap - 5 PK CAP

$2.66
In stock
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-666TK5
CP-666TK5

A/C Service Valve Cap - 5 PK CAP

$1.20
In stock
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-665TK5
CP-665TK5

A/C Service Valve Cap - 5 PK CAP

$1.26
In stock
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-651TK5
CP-651TK5

A/C Service Valve Cap - 5 PK CAP

$2.65
In stock
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-652TK5
CP-652TK5

A/C Service Valve Cap - 5 PK CAP

$2.65
In stock
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-654TK5
CP-654TK5

A/C Service Valve Cap - 5 PK CAP

$2.73
In stock
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-657TK5
CP-657TK5

A/C Service Valve Cap - 5 PK CAP

$2.67
In stock
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-664TK5
CP-664TK5

A/C Service Valve Cap - 5 PK CAP

$2.67
In stock
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-656TK5
CP-656TK5

A/C Service Valve Cap - 5 PK CAP

$2.70
In stock
Image of A/C Service Valve Cap - DISABLER PORT CAP 1/4" ALUMINUM from Sunair. Part number: 091-A5050
091-A5050

A/C Service Valve Cap - DISABLER PORT CAP 1/4" ALUMINUM

$1.95
Image of 4" FEMALE VENTED LOCKING CAP from Velvac Inc. Part number: 600181-6
600181-6

4" FEMALE VENTED LOCKING CAP

$176.10
Image of 4IN DSL CAP, LVR STY, LKG, INDV from Velvac Inc. Part number: 600212
600212

4IN DSL CAP, LVR STY, LKG, INDV

$195.12
Image of DIESEL CAP 3.5-5.5NS FULL FUN/VENTED from Velvac Inc. Part number: 600260
600260

DIESEL CAP 3.5-5.5NS FULL FUN/VENTED

$75.80
Image of FEMALE, LOCKING, NON-VENTED 1/4 TURN from Velvac Inc. Part number: 600149
600149

FEMALE, LOCKING, NON-VENTED 1/4 TURN

$172.20
Image of 2" LOCKING ALUM FUEL CAP ASSY from Velvac Inc. Part number: 600270
600270

2" LOCKING ALUM FUEL CAP ASSY

$72.25
Image of REPL KEY # 33 FOR LOCKING CAP from Velvac Inc. Part number: 600633
600633

REPL KEY # 33 FOR LOCKING CAP

$9.88
Image of 2"FEMALE NON-VENTED/NON-LOCKING CAP from Velvac Inc. Part number: 600009
600009

2"FEMALE NON-VENTED/NON-LOCKING CAP

$36.71
Image of REPLACEMENT KEY #19 FOR FUEL CAPS from Velvac Inc. Part number: 600219
600219

REPLACEMENT KEY #19 FOR FUEL CAPS

$9.83
Image of 4" FEMALE NON-VENTED LOCKING CAP from Velvac Inc. Part number: 600169-6
600169-6

4" FEMALE NON-VENTED LOCKING CAP

$106.66
Image of RUBBER PADS FOR SADDLE TANK from Velvac Inc. Part number: 060033
060033

RUBBER PADS FOR SADDLE TANK

$5.88
Image of 4" FEMALE NON-VENTED NON-LOCKING CAP from Velvac Inc. Part number: 600168
600168

4" FEMALE NON-VENTED NON-LOCKING CAP

$57.93
Image of ANTI-SPRHON TUBE 4"-4.00"FILLER NECK from Velvac Inc. Part number: 600258
600258

ANTI-SPRHON TUBE 4"-4.00"FILLER NECK

$59.08
Image of FILLER NECK ADAPTER KIT from Velvac Inc. Part number: 600112
600112

FILLER NECK ADAPTER KIT

$47.19
Image of A/C Service Valve Cap - R-134A VALVE PORT CAP MASTER ASSORT from Sunair. Part number: KT-CAP-R134A
KT-CAP-R134A

A/C Service Valve Cap - R-134A VALVE PORT CAP MASTER ASSORT

$31.23
Image of REPL KEY # 31 FOR LOCKING CAP from Velvac Inc. Part number: 600631
600631

REPL KEY # 31 FOR LOCKING CAP

$9.88
Image of 2-1/2" FEMALE VENTED NON-LOCKING CAP from Velvac Inc. Part number: 600136
600136

2-1/2" FEMALE VENTED NON-LOCKING CAP

$72.75
Image of REPLACEMENT LOCK-GUARD CAP from Velvac Inc. Part number: 600176
600176

REPLACEMENT LOCK-GUARD CAP

$13.10
Image of 2" FEMALE NON-VENTED NON-LOCKING CAP from Velvac Inc. Part number: 600198
600198

2" FEMALE NON-VENTED NON-LOCKING CAP

$43.54
Image of REPLACEMENT GASKET FOR 2-1/2" CAP from Velvac Inc. Part number: 600021
600021

REPLACEMENT GASKET FOR 2-1/2" CAP

$7.00
Image of 3" FEMALE VENTED LOCKING CAP from Velvac Inc. Part number: 600183-6
600183-6

3" FEMALE VENTED LOCKING CAP

$106.05
Image of A/C Service Valve Cap - DISABLER PORT CAP 3/16" ALUMINUM from Sunair. Part number: 091-A5055
091-A5055

A/C Service Valve Cap - DISABLER PORT CAP 3/16" ALUMINUM

$1.93
Image of 3" FEMALE VENTED LOCKING CAP from Velvac Inc. Part number: 600185-6
600185-6

3" FEMALE VENTED LOCKING CAP

$81.61
Image of A/C Service Valve Cap - 5 PK CAP from Sunair. Part number: CP-663TK5
CP-663TK5

A/C Service Valve Cap - 5 PK CAP

$2.65
Image of DIESEL CAP 3.5-5.5 NS LOCK THERM REL from Velvac Inc. Part number: 600263
600263

DIESEL CAP 3.5-5.5 NS LOCK THERM REL

$114.42
Image of FILLER NECK ADAPTER KIT from Velvac Inc. Part number: 600191
600191

FILLER NECK ADAPTER KIT

$57.08
Image of 2" FEMALE NON-VENTED NON-LOCKING CAP from Velvac Inc. Part number: 600133
600133

2" FEMALE NON-VENTED NON-LOCKING CAP

$37.75