Quick Coupling Screw AR1 BPS1/4M Anti Allergen and Mattress Cleaning Reusing a distorted washer is

Reusing a distorted washer is a slow leak waiting to happen

For pressurised solution lines use threaded fittings rated for the job

and press it down onto the surface

sticky tape residue

Quick Coupling Screw AR1 BPS1/4M Anti Allergen and Mattress Cleaning Reusing a distorted washer isQuick Coupling Screw AR1 BPS1 4M QUICK COUPLING SCREW AR1 BPS1 4M (with O Ring and Backup Ring) Specifications Type Quick coupling screw, AR1 BPS 1 4 male Supplied with O ring and backup ring The backup ring is not optional A backup ring sits behind the O ring and stops it extruding into the clearance gap under pressure. Fitting the O ring without it gives you a joint that seals on the bench and fails under working pressure which is exactly when you