Newbie plumbing question,is it ok to slide vinyl tubing over straight pvc and use clamps or do I have to use a barbed fitting to slide the tubing over,reason I ask is I purchased some 3/4" barb insert x slip 90 degree fittings and the slip end seems very loose in the 3 /4" bulkhead, the pvc pipe seems to be a snugger fit,will the barb fitting be ok with the primer and glue? or should I just use straight pvc and a 90 degree elbow?,hope this makes sence.