This is a quick disconnect fitting to hose barb. Therefore it will attach to flexible tubing on the hose barb side and another mating quick disconnect fitting on the adapter side.

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CPC (Colder) HFCD16812 Valved Bulkhead Panel Mount Hose Barb, PP, 3/8" Flow Size, 1/2" ID

Q: Can no longer "quick" connect after about 20 disconnect/connect cycles. Must use plyers to get it apart. Any ideas?

Try a touch of water based lubricant, works fine

Q: What does 3/8" flow size, 1/2" id mean? which is it, 3/8 or 1/2?

The 1/2" ID indicates the hose barb size which accepts soft tubing with a 1/2" tubing inner diameter. The flow size indicates the diameter of the inner flow path and the mating side of the connector must have the same flow path size for them to connect properly.

Q: going to use white silicone tubing with these. which hose clamp is recommended?

I picked up a couple from a Home Brewing supply store, that have worked perfectly. Don’t recall the exact size, but I just took the pieces to the store and they had a perfect fit. The have thumb screws, so easy on, easy off.

Product ID: 382027827

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Details

Brand
Colder
Material
Polypropylene
Item weight
0.07 Kilograms
UPC
696504955504
Manufacturer
Cole-Parmer

💧3/8" optimized flow size

🔩Secure valved bulkhead mount

⚙️Durable polypropylene build

Description

💧 Flow with confidence, mount with ease!

COMPACT LIGHTWEIGHT - Only 70g with a sleek 7.11 x 4.57 x 4.57 cm footprint—fits where others can’t
ENGINEERED FOR PRECISION - 3/8" flow size ensures efficient fluid transfer without compromise
MAINTENANCE FREE OPERATION - No batteries or extra parts needed—plug and play reliability
SEAMLESS BULKHEAD INTEGRATION - Valved panel mount design for leak-proof, easy installation
ROBUST POLYPROPYLENE CONSTRUCTION - Lightweight yet highly durable material built to last in demanding environments

The CPC HFCD16812 Valved Bulkhead Panel Mount Hose Barb by Cole-Parmer is a compact, lightweight polypropylene coupling designed for secure, leak-resistant fluid connections. Featuring a 3/8" flow size and a 1/2" ID, it offers precision fluid control with easy panel mounting, ideal for professional setups demanding durability and efficiency.

Specifications

Manufacturer	Cole-Parmer
Part number	AO-31303-21
Item Weight	70 g
Product Dimensions	7.11 x 4.57 x 4.57 cm; 70 g
Item model number	AO-31303-21
Material	Polypropylene (PP)
Shape	bulkhead ;coupling ;
Item Package Quantity	1
Measurement System	US
Batteries Included?	No
Batteries Required?	No

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Can no longer "quick" connect after about 20 disconnect/connect cycles. Must use plyers to get it apart. Any ideas?

What does 3/8" flow size, 1/2" id mean? which is it, 3/8 or 1/2?

going to use white silicone tubing with these. which hose clamp is recommended?

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