John Guest Drinks Grey Acetal Stem Adaptor BSPT
Technical Specification
- Material: Acetal Copolymer (Unfilled)
- Working Pressure: 16 bar (7 bar at 65°C)
- Working Temperature: 1°C to 65°C
- Thread Type: Male BSPT (British Standard Pipe Taper)
- Push Fit: Stem adaptor fits directly into other JG Pushfit Fittings
- Food-grade Material: Suitable for use with foodstuffs and potable liquids.
- Features: Instant leak-tight connection that is fully demountable.
- Manufacturing: Manufactured and assembled in the UK by John Guest.
- Approvals: WRAS approved and BSI Kitemark certified


Description
This stem adaptor is designed to convert an imperial push-fit tube connection into a male BSPT threaded interface. It provides a straightforward way to connect beer, beverage or gas lines into BSPT threaded equipment commonly found in pub and cellar installations. The push-fit side creates an instant leak tight seal without tools, hot works or sealing agents. Its secure collet design holds the tube firmly without deforming it or restricting flow, helping maintain stable pressure and consistent dispense performance.
Manufactured from strong acetal copolymer, the adaptor delivers an airtight connection with reliable flow characteristics. It is suitable for potable liquids, food grade liquids and inert gases. In accordance with the British Beer and Pub Association Code of Practice, it can be used on N2, CO2 and mixed gas dispense lines, as well as air, pneumatic and vacuum systems. With a wide range of imperial tube and thread size combinations available, this stem adaptor offers flexibility when connecting into pumps, regulators, coolers, or other threaded components within drinks dispense systems. Fully demountable on the push-fit side, it supports quick maintenance and system modifications in busy commercial environments.
Key Features & Benefits
- Male BSPT threaded connection: Converts imperial push-fit tube to BSPT threaded equipment.
- Push-fit installation: Tool-free connection with immediate leak tight sealing.
- Designed for drinks dispense systems: Suitable for beer lines, beverage feeds and gas applications in pubs and bars.
- Airtight performance: Strong acetal body supports secure beverage and gas connections.
- Secure collet retention: Holds tubing firmly without restricting internal bore.
- Fully demountable: Enables quick servicing and straightforward system upgrades.
Dimensions


| Product Code | Manufacturer Code | Size | A (Stem O/D) |
B | C | D | E | F | G |
| 381935 | PI050801S | 1/4" x 1/8" | 1/4" | 0.54" (13.8mm) | 0.25" (6.4mm) | 0.40" (10.2mm) | 0.67" (17.0mm) | 0.15" (3.8mm) | 0.72" (18.3mm) |
| 381936 | PI050802S | 1/4" x 1/4" | 0.54" (13.8mm) | 0.25" (6.4mm) | 0.44" (11.2mm) | 0.67" (17.0mm) | 0.17" (4.4mm) | 0.72" (18.3mm) | |
| 381937 | PM050801S | 5/16" x 1/8" | 5/16" | 0.59" (15.0mm) | 0.25" (6.4mm) | 0.40" (10.2mm) | 0.67" (17.0mm) | 0.16" (4.1mm) | 0.72" (18.3mm) |
| 381938 | PM050802S | 5/16" x 1/4" | 0.59" (15.0mm) | 0.25" (6.4mm) | 0.44" (11.2mm) | 0.67" (17.0mm) | 0.22" (5.6mm) | 0.72" (18.3mm) | |
| 492273 | PM050803S | 5/16" x 3/8" | 0.59" (15.0mm) | 0.25" (6.4mm) | 0.50" (12.7mm) | 0.79" (20.0mm) | 0.18" (4.5mm) | 0.86" (21.8mm) | |
| 381939 | PI051202S | 3/8" x 1/4" | 3/8" | 0.70" (17.8mm) | 0.30" (7.6mm) | 0.44" (11.2mm) | 0.79" (20.0mm) | 0.23" (5.8mm) | 0.86" (21.8mm) |
| 381940 | PI051203S | 3/8" x 3/8" | 0.70" (17.8mm) | 0.25" (6.4mm) | 0.50" (12.7mm) | 0.79" (20.0mm) | 0.23" (5.8mm) | 0.86" (21.8mm) | |
| 381941 | PI051603S | 1/2" x 3/8" | 1/2" | 0.81" (20.5mm) | 0.30" (7.7mm) | 0.50" (12.7mm) | 0.94" (24.0mm) | 0.38" (9.6mm) | 1.03" (26.3mm) |
| 381942 | PI051604S | 1/2" x 1/2" | 0.81" (20.6mm) | 0.25" (6.4mm) | 0.63" (16.0mm) | 0.94" (24.0mm) | 0.38" (9.6mm) | 1.03" (26.3mm) |

