The Nitemare Performance 'Pro O-ringed Oil Block' is a low profile design (¾" thick) giving important extra clearance over other designs. The aluminum block is clear anodized and accepts ½ NPT fittings. The block comes with two high temperature O-rings and three grade 8 clear coated flange head bolts. No gaskets are needed as they are replaced by the O-rings. This is a 100% leak free design. For more details and information on this product CLICK HERE.