1 x 1 Brass Union, Female thread x Female thread

The Nr. 340 - Union Coupler is a standard brass fitting with a female thread connection produced according to DIN EN standard.

3/8 Tube O.D. x 3/4-16 Thread, D.O.T. Air Brake Quick Connect Female Bulkhead Union - Hi-Line Inc.

3/4 FNPT X 3/4 BSPP Male Brass Adapter (NPT X BSPP)

½ Male x ¾ Female Brass Union Set for Water Meters

NPT 1/2 Female Thread to 1/2 Inch Male Thread Pipe Fitting Converter A — gotonovo

The Nr. 340 - Union Coupler is a standard brass fitting with a female thread connection produced according to DIN EN standard.

1 x 1 Brass Union, Female thread x Female thread

Tectite 1/2 in. Brass Push-to-Connect x Female Pipe Thread Adapter FSBFA12 - The Home Depot

1-1/2 IPS Butt Fusion x Brass Male Threaded Transition DR11 - Hdpe Supply

Plumbing Page 7 — Dalton Engineering

1/2 3/4 1 Inch Threaded Pipe Union Fittings Female x Male

Brass, 1/2 in x 1/2 in Fitting Pipe Size, Union - 46M493

Parker - Industrial Pipe Union: 3/8″ Female Thread, FNPTF - 81010399 - MSC Industrial Supply

UNION, 1/4MFL x 1/4MFL (BRASS) - Foxx Equipment Company

Brass Plumbing Fittings Movable Joint Water Tank Fittings 1/4 3/8 1/2 3/4 1 Female Thread - AliExpress

Press Fitting - 15mm Female & R 3/4'' Male - Copper alloy