The most common pipes have the following section - round. All plastic plugs are marked exactly like pipes. Black/White colour. To keep wate r out and stop rusting from inside. Made from plastic.
eBay
100Pcs 0.5ml/1.5ml/2ml Micro Centrifuge Tube with Cap Sample Vial Container Test Tube Transparent Plastic Tube Lab Instrument
Aliexpress UK
The most common pipes have the following section - square. All plastic plugs are marked exactly like pipes. Black colour. To keep wate r out and stop rusting from inside. Made from plastic.
eBay
10PCS 15x150mm Plastic Test Tubes Vials Sample Container Sample Tube With Cap For Office School Chemistry Supplies
Aliexpress UK
The most common pipes have the following section - square. All plastic plugs are marked exactly like pipes. Black colour. To keep wate r out and stop rusting from inside. Made from plastic.
eBay
10Pcs 12x100mm Transparent Laboratory Plastic Test Tubes With Caps Stoppers School Lab Supplies Accessories
Aliexpress UK
The most common pipes have the following section - round. All plastic plugs are marked exactly like pipes. - very strong and effective clamping of the stainless steel plate on the end cap. - plate secured with a protective film.
eBay
100ML/200ML/300ML/500ML large syringe with 1 meter long tube, cap, converter, syringe, for scientific laboratory, liquid, plant
Aliexpress UK
Round End Cap 10mm 0.8 - 1.5 10 3.6 10.5 5.1 8.6. Plastic plugs made of injection-moulded plastic, designed for sealing profiles. The matt structure of the upper part of the cap gives it an aesthetic appearance.
eBay
Disposable 10ml Vacuum Collection Tube Lab sampling Collecting Tube yellow cap ACD tube，glass tube，100Pcs/Pack
Aliexpress UK
The most common pipes have the following section - round. All plastic plugs are marked exactly like pipes. Black colour. To keep wate r out and stop rusting from inside. Made from plastic.
eBay
50ml 10Pcs Plastic Tubes Spiral Caps Test Tube Storage Small Vials Polypropylene Scientific Experiments Educational
Aliexpress UK
Black colour. High quality product. Plasttex LTD.
eBay
10 Pieces 50ML/15ML/10ML Laboratory Sample Screw Round Bottom Plastic Test Tube Ep Tube with Scale Screw Cap Centrifuge Tube
Aliexpress UK
The most common pipes have the following section - square. All plastic plugs are marked exactly like pipes. Black colour. To keep wate r out and stop rusting from inside. Made from plastic.
eBay
20Pcs Clear Plastic Test Tubes with Lids 40ml Candy Tube Organizer with Leak-Proof Caps Tubes Container for Sample Bath Salt
Aliexpress UK