Threaded plug / round / metal

Clippard

Male plug / round / plastic

West Coast Lockwasher

Snap-on plug / round / nylon / ventilated

Skiffy

Non-threaded plug / brass / leak-proofing

Vulkan Lokring Rohrverbindungen Gmbh Co Kg

Snap-on plug / round / plastic / protection

Parker Engineered Seals Division

Threaded plug / round / metal

Aquatherm Gmbh

Male plug / round / plastic

Aquatherm Gmbh

Threaded plug / round / with drain

Giacomini

Snap-on plug / round / rubber / oil

Emile Maurin

Threaded plug / round / technopolymer / oil

Emile Maurin

Threaded plug / round / plastic

Emile Maurin