Brass Coupling Hex Adapter Equal Female Connector.

M-F Extension Fitting Brass Finish (Hex Interior)

MS Coupling Female Socket Connector Commercial Forged Type

Pressure Gauge Back Connection Panel Mounting 1/8 BSP (50MM / 2 Dial)

SS Barrel Pipe Nipple Round ERW Commercial Stainless Steel 202 (LENGTH:150mm- 4'' Long)

Brass Hex Adapters

Uenede 8PCS 1/8 Inch NPT Brass Hex Nipple Coupling 1/8 NPT x 1/8 NPT Female Threaded Equal Diameter Coupler Air Hose Pipe Fittings Adapter for Water/Oil/Gas - Yahoo Shopping

Pressure Gauge Back Connection 1/8 BSP (50MM / 2 Dial)

Pressure Gauge Back Connection Panel Mounting 1/8 BSP (50MM / 2 Dial)

Brass Pipe Fitting G1/4 Adapter Extension Connector Hex Coupling 2 Pcs - Yahoo Shopping

2-Pack 1 Male x 3/4 Female Brass Pipe Fitting Hex Bushing, Reducer Adapter Hex Head convertor (included a Sealing Tape)

MS Coupling Female Socket Connector Commercial Forged Type

LTWFITTING 1/4 in. FIP x 1/4 in. MIP Brass Pipe Adapter Fitting (5-Pack) HF1024405 - The Home Depot