Simax Burettes, class A (ISO-835) have a self lubricating class A teflon stopcock (2mm bore) plug.

Product #	Brand	Product	Size	Graduations	Price
1567AKT-10	Simax	Burette	10 ml	0.1 ml	$66.00
1567AKT-25	Simax	Burette	25 ml	0.1 ml	$69.00
1567AKT-50	Simax	Burette	50 ml	0.1 ml	$72.00
1567AKT-100	Simax	Burette	100 ml	0.2 ml	$90.00