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Mainstream Engineering, KD, ESP, Power Tools, Tools, Testing, Tools & Training, Temperature & Humidity Measurement, Test Instruments, Ventilation & IAQ, Supplies


Li'L Popper 3A Control Circuit Tester G33-039
Li'L Popper 3A Control Circuit Tester
Description: 3A Control Circuit Tester;
Brand: ESP Mfg #: POP3

Li'L Popper 5A Control Circuit Tester G33-040
Li'L Popper 5A Control Circuit Tester
Description: 5A Control Circuit Tester;
Brand: ESP Mfg #: POP5



Universal Humidifier Solenoid B17-395
Universal Humidifier Solenoid
Description: Universal Humidifier Solenoid 24V Kit with Multiple Fittings;
Brand: ESP Mfg #: UHS24



QwikInjector® Service Tool B13-045
QwikInjector® Service Tool
Size: 1/2 Oz.;
Brand: Mainstream Engineering Mfg #: QT2510

Flex Connect Flexible Coupling R59-074
Flex Connect Flexible Coupling
Description: 2" PVC Flexible Connector;
Brand: ESP Mfg #: FLEXCON2


Replacement Humidifier Pad B12-142
Replacement Humidifier Pad
Description: 9-7/8" x 9-7/8" x 1-7/8"; Replaces: Aprilaire Models 110, 120, 550;
Brand: ESP Mfg #: A10PR

Glycol Tester B13-597
Glycol Tester
Description: Glycol Tester;
Brand: ESP Mfg #: RHB-82G

Replacement Humidifier Pad B12-144
Replacement Humidifier Pad
Description: 10" x 13" x 1-1/2"; Replaces: Aprilaire Model 350, 360, 560, 760;
Brand: ESP Mfg #: A35PR


Replacement Humidifier Pad B12-143
Replacement Humidifier Pad
Description: 14-7/8" x 11-3/8" x 1-7/8"; Replaces: Aprilaire Models 112, 136, 224, 440, 445;
Brand: ESP Mfg #: A12PR

Flex Connect Flexible Coupling R59-075
Flex Connect Flexible Coupling
Description: 3" PVC Flexible Connector;
Brand: ESP Mfg #: FLEXCON3


Qwik System Flush® 2 Lb. Replacement Canister B85-589
Qwik System Flush® 2 Lb. Replacement Canister
Description: Qwik System Flush 2 Lb Refill;
Brand: Mainstream Engineering Mfg #: QT1100

Flex Connect Flexible Coupling R58-761
Flex Connect Flexible Coupling
Description: ¾" PVC Flexible Connector 6 Pk.;
Brand: ESP Mfg #: FLEXCON34-6

Universal Humidifier Solenoid B21-079
Universal Humidifier Solenoid
Description: Universal Humidifier Solenoid 24V;
Brand: ESP Mfg #: UHS99

Flex Connect Flexible Coupling R59-076
Flex Connect Flexible Coupling
Description: 1/2" to 3/4" PVC Flex Bushing 6 Pk.;
Brand: ESP Mfg #: FLEXB-6


Sure Temp B13-598
Sure Temp
Temp. Range: -40°F to +180°F;
Brand: ESP Mfg #: ST1236-31
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