They are Monk Locomotive close brass pipe nipple Mittens Fortress Rub
LTWFITTING 2 in. MIP Brass Pipe Close Nipple Fitting HF106320001 - The Home Depot
Brass Close Nipple, 1-1/8 Length, Male (1/2-14 NPT) – AGS Company Automotive Solutions
Everbilt 3/8 in. x Close MIP Brass Nipple Fitting 802419 - The Home Depot
1/2" Close Nipple - Brass – NY Brew Supply
Dixon Brass Close Pipe Nipples, MNPT, Lead Free - John M. Ellsworth Co. Inc.
BRN050 - Bluefin BRN050 - 1/2" x Close Brass Nipple (Lead Free)
Eastman Lead Free 1/2" Male NPT MPT MIP Close Nipple Brass Pipe Fitting Fuel / Air / Water / Boat / Gas / Oil WOG (1/2" x 2.5" brass nipple) - Walmart.com
112A-B | ANDERSON BRASS FITTING<BR>1/4" NPT MALE CLOSE NIPPLE | The Pneumatic Store
Merit Brass-1-1/2XCLOSE BRASS NIPPLE LEAD FREE - Columbia Pipe: Industrial Pipes,Fittings & Connectors
CN150B Dixon Valve Brass 1-1/2" Close Pipe Nipple — HoseWarehouse
Sioux Chief® 1" x Close Brass Nipple at Menards®
TRUE VALUE COMPANY (ORDERS) Pipe Fittings, Red Brass Nipple, Lead Free, 1-In. x Close | Killingworth True Value
Close Nipple, 1/8 NPT Brass - Pegasus Auto Racing Supplies
Brass Nipple
TBN-12CLOSE - Cello TBN-12CLOSE - 3/4" x Close Brass Nipple