This right-angled grease coupler has a 1000 PSI maximum pressure, with a 1/8" NPT inlet and a 1/8" FNPT fitting end. It fits all standard grease guns, eliminating the need to switch to a 90-degree grease zerk fitting. This steel coupler is designed for 90-degree access onto grease fittings and is useful in greasing fittings with limited access, or in low heights where a grease gun with a regular coupler is difficult to use. This coupler has a hardened slot for increased resistance to wear.