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Union Connectors 

3/8 Tubing Connectors


PUC 3/8 Straight Connector $1.32

Straight, 3/8 2 port union connector to connect FR-12 and FR-25 3/8 OD tubing. 

Slip fit type union connectors with disconnect feature. Most often used on red valve connector of Flexdamper to connect 3/8 OD tubing. Pre-installed on all Flexdampers using 3/8 OD tubing, order extras only for spares and connecting cut lengths of 3/8 OD tubing. 


PUT 3/8 T connector $2.58 

3/8 3 port union connector to connect FR-12 and FR-25 3/8 OD tubing. 

Slip fit type union connectors with disconnect feature. Use to daisy chain multiple 

Flexdampers, or to create a manifold by the SPP panel. Very popular part when used with 3/8 OD tubing, order one for every damper plus a few spares.


PK 3/8 5 Port Manifold Connector $5.28

3/8 5 port manifold reducing connector.

5 port manifold union connector, to connect FR12 and FR25 3/8 OD tubing.

Straight through ports are 3/8 OD and 3 branch ports are 3/8 OD. Slip fit type union connectors with disconnect feature.

Where to use: Primary use is at outlet of SPP panel to create manifold to connect FR12 or FR25 3/8 OD tubing to the 3/8 outlet tubing of SPP panel, when 3/8 OD tubing is being home run, to create a cleaner and neater field installation. Be sure to order 4 feet of 3/8 tubing for this purpose. P/N FR-5. 

Popular part when used with 3/8 OD tubing for manifolding, when 3/8 tubing is being home run. Order one for every 3 dampers plus a few spares.

Reducing Tubing Connectors 

3/8 to 1/4


PG 3/8 to 1/4 inch 2 port reducing connectors $2.16

PG 3/8-1/4 Straight reducing connector 

Straight 2 port reducing union connector, to connect FR12 and FR25 3/8 OD tubing to 

FR25 to FRS-25 1/4 OD tubing. Slip fit type union connectors with disconnect feature.

Most often used on red valve connector of Flexdamper to connect 1/4 OD tubing.

Pre-installed on all Flexdampers using 1/4 OD tubing, 

order extras only for spares and connecting lengths of 1/4 OD to 3/8 OD tubing.


PGT 3/8- 1/4 T 3 port reducing connector $1.74

3 port T union connector, to connect FR12 and FR25 3/8 OD tubing to 

FRS-25 1/4 OD tubing. Straight through ports are 3/8 and branch port is 1/4. Slip fit type union connectors with disconnect feature.

Where to use: Primary use is at outlet of SPP panel to create manifold to connect FRS 1/4 OD smaller tubing to 3/8 outlet tubing of SPP panel, to allow less air restriction to individual 1/4 OD tubes. Be sure to order 5 feet of 3/8 tubing for this purpose, P/N FR-5

Very popular part when used with 1/4 OD tubing, order one for every damper plus a few spares.


PK3 3/8-1/4 5 Port reducing connector $5.10

3/8- 1/4 T 5 port manifold reducing connector.

5 port manifold union connector, to connect FR12 and FR25 3/8 OD tubing to 

to FRS-25 1/4 OD tubing. Straight through ports are 3/8 and 3 branch ports are 1/4. Slip fit type union connectors with disconnect feature.

Where to use: Primary use is at outlet of SPP panel to create manifold to connect FRS 1/4 OD smaller tubing to 3/8 outlet tubing of SPP panel, to allow less air restriction to individual 1/4 OD tubes, and to create a cleaner field installation. Be sure to order 5 feet of 3/8 tubing for this purpose, P/N FR-5 

Popular part when used with 1/4 OD tubing for manifolding, order one for every 3 dampers plus a few spares.

1/4 inch Only Connectors


PUT 1/4 T 3 port connector $2.35

1/4 3 port union connector to connect FRS-25 1/4 OD tubing. 

Slip fit type union connectors with disconnect feature. 

Use to create a manifold by the SPP panel.

Very popular part when used with 1/4 OD tubing, order one for every damper plus a few spares.


PUC 1/4 Straight 2 port Connector $1.74

Straight, 1/4 2 port union connector to connect and FRS-25 1/4 OD tubing. 

Slip fit type union connectors with disconnect feature. 

Typically only used to connect cut lengths of 1/4 OD tubing. 


PK 1/4 5 Port Manifold Connector $3.84

1/4 5 port manifold reducing connector.

5 port manifold union connector, to connect FRS25 1/4 OD tubing.

All ports are 1/4 inch. Slip fit type union connectors with disconnect feature.

Where to use: Primary use is at outlet of SPP panel to create manifolds to connect FRS 1/4 OD home-run tubing, to create a cleaner and neater field installation. 

Popular part when used with 1/4 OD tubing for manifolding, when 1/4tubing is being home run. Order one for every 3 dampers plus a few spares. 1/4 inch T’s may also be used.