Breather cap, push-fit, in polyamide-based technopolymer with RAL 2004 orange colour cover with the word "OIL" and black fitting, push-fit assembly on tubes with max. external diameter 39 mm and min. internal diameter 32 mm, pressure spring in burnished steel and annular air filter in cross-linked polyurethane foam (polyester base) "tech-foam" with filtration fineness 40 µ.