Kobalt NPT Coupler/Plug Kit 1/4-in Automotive in the Air Compressor Fittings department at Lowes.com
Air Hose & Fittings | Compressed Air Accessories - RapidAir Products
Pneumatic Gas Air Hose Quick Coupler Connector Fittings UNF 10-32 For 4mm OD and 2.5mm ID Soft Plastic Tube
3 Way Air Hose Fitting, 4mm | ATO.com
Air Compressor Quick Connect Pneumatic Fittings Air Hose Connector Easy to Use - Walmart.com
Xhnotion - Pneumatic Push in Female Straight BSPP Thread Air Hose Fitting with 100% Tested - China Pneumatic Fitting, Air Hose Fittings | Made-in-China.com